PHYS 153 - Final Exam (Practice Tests and Tests)

The index of refraction for diamond is 2.5. Which of the following is correct for the situation shown? (Test 2 - No 32) (sin a)/(sin b) = 2.5 (sin b)/(sin d) = 2.5 a/c = 2.5 (sin c)/(sin a) = 2.5 (cos a)/(cos c) = 2.5

(sin c)/(sin a) = 2.5

A dime is viewed through a negative lens (focal length of -4.0 cm). The dime is 4 cm from the lens as seen in the figure. Where is the image of the dime? (Hint: A positive image distance is to the right of the lens; a negative image distance is to the left of the lens.) (Test 2 - No 26 image) +4 cm. -4 cm. -2 cm. +2 cm. -1 cm.

-2 cm.

A convex mirror is used to reflect light from an object placed 52 cm in from of the mirror. The focal length of the mirror is f=-44 cm (note the minus sign). Find the location of the image (in cm).

-23.83 ± 5%

A dime is viewed through a positive lens (focal length of + 4.0 cm). The dime is 2 cm from the lens as seen in the figure below. Where is the image of the dime? (Hint: A positive image distance is to the right of the lens and a negative image distance is to the left of the lens.) dime through lens: (Practice Test 2 - No 4 image) -1 cm. -4 cm. -2 cm. +4 cm. +2 cm.

-4 cm

A student wears 2.5 diopter contact lenses. What is the focal length of these lenses? 4.0 m 0.40 m 4.0 cm 25 cm 2.5 m

0.40 m

Shown below are six waves, which are all the same kind of wave (e.g., all seismic waves) traveling in: various media. The waves all have the same frequency, but their amplitudes, A, and wavelengths, vary as shown in the figures. Specific values for these properties are given in each figure. Rank these waves from greatest to least based on the speed of the waves. That is, put first the wave that is moving fastest and put last the wave that is moving slowest. If two waves have the same speed, put them in alphabetic order. (practice exam 1 - Questions 6 image)

1. C 2. D 3. A 4. E 5. B 6. F

Place the following numerical prefixes in order from smallest to largest. nano mili micro centi

1. nano 2. micro 3. mili 4. centi

Please put these actions of the scientific method in order. hypothesize test observe accept, reject, modify

1. observe 2. hypothesize 3. test 4. accept, reject, modify

Put the following types of electromagnetic radiation in order of increasing frequency. visible light x-rays radio waves ultraviolet light infrared waves

1. radio waves 2. infrared waves 3. visible light 4. ultraviolet light 5. x-rays

The rectangular metal tank shown is filled with an unknown liquid. The observer, whose eye is level with the top of the tank, can just see corner "E", The index of refraction of this liquid is: (Practice Test 2 - No 8) 1.33 1.75 1.25 1.67 1.50

1.25

What is the speed (in m/s) of light in glass that has an index of refraction of 0.2?

1.50E9 ± 3%

A single 40-W incandescent lamp emits 500 lumens and a single 100-W lamp emits 1750 lumens. (Hint: At 550 nm, 1 W = 683 lumens.) Estimate the efficiency of the 40-W lamp in terms of light power out compared to electric power in. 56 lm/W 5.6 % 0.18 % 1.8% 18 lm/W

1.8%

The diagram shows the passage of a ray of light from air into a substance X. What is the index of refraction for substance X? (Practice Test 2 - No 7): 0.53 3.0 1.9 0.88 2.2

1.9

Match the prefix with the scientific notation for the order of magnitude of the number. kilo mega giga tera

10^3 10^6 10^9 10^12

You hold a hand mirror 0.5 m in front of you and look in it at your reflection in a full-length mirror 1 m behind you. How far in back of the big mirror do you see the image of your face? 2.0 m 1.0 m 1.5 m 2.5 m 0.5 m

2.0 m

The near point of the "normal" eye is: 25 mm 1.0 m infinity 25 cm 25 m

25 cm

The speed of light is 186 mi/h 3.0x10^8 mi/h 340 m/s 3.0x10^8 m/s 340 ft/s

3.0x10^8 m/s

What is the wavelength (in m) of an electromagnetic wave that has a frequency of 96.2 MHz?

3.1 ± 3%

Calculate the energy (in eV) of a photon that has a wavelength of 341 nanometers. Use the following value for Planck's constant: 4.1x10-15 eV s.

3.6 ± 3%

Although glass is transparent you can see it because some light is reflected at its surface. Approximately how much light at normal incidence is reflected from an air-glass interface? 50% 4% 0% 80% 25%

4%

What is the strength (in diopters) of a converging lens with a focal length of 24 cm?

4.2 ± 3%

The range of wavelengths of the visible spectrum is: 400 - 700 nm 300 - 600 mm 300 - 900 nm 400 - 700 μm 300 - 600 μm

400 - 700 nm

How many meters in 47.6 kilometers?

47,600

The critical flicker fusion frequency is: 30 Hz 72 Hz 50 Hz 24 Hz 120 Hz

50 Hz

A coin is located 26 cm from a concave spherical mirror of 35 cm radius of curvature. Locate the image of the coin (cm).

53.53 ± 5%

A 42.2 Watt cool-white fluorescent lamp emits 3,223 lumens. What is the efficacy of the lamp?

76.4 ± 3%

What is the frequency (in Hz) of light that has a wavelength of 333 nanometers in free space?

9.0E14 ± 5%

Which of the following sources will give the sharpest shadow of an object placed between the source and a screen? A 40-W fluorescent lamp. A clear envelop lamp with a large filament. A frosted incandescent lamp. The Sun. A point source.

A point source.

The diagram shows total internal reflection. Which of the following statements is NOT true? (Practice Test 2 - No 9) if angle AON were increased, there would still be total internal reflection. The speed of light in medium II is greater that that in medium I. Angle AON is the angle of incidence. Angle AON must be the critical angle. Angle AON = Angle BON.

Angle AON must be the critical angle.

A hollow diverging lens is made of thin glass as shown. It can be filled with air, water (n=1.3) or CS2 (n=1.6). The lens will diverge a beam of parallel light if it is filled with: CS2 and immersed in CS2. air and immersed in air. CS2 and immersed in water. water and immersed in CS2. air and immersed in water.

CS2 and immersed in water.

Choose the correct statement. Blue light has a higher frequency than gamma rays. Gamma rays have higher frequency than infrared waves. Electrons are a type of electromagnetic wave. Ultraviolet light has a longer wavelength that infrared. Radio waves have a higher frequency than infrared waves.

Gamma rays have higher frequency than infrared waves.

When incident unpolarized light of intensity I0 is passed through a single ideal linear polarizer the resulting light intensity is: 2 Io Io (2)^1/2*Io Io /(2)^1/2 Io /2

Io /2

A second ideal polarizer is placed after a first polarizer, which has unpolarized light incident upon it. The polarization direction of the second polarizer is oriented at 45o to that of the first polarizer. What is the intensity of the light that passes through the second polarizer? (2)^1/2I0 Io /2 Io /8 Io Io /4

Io /4

A third ideal polarizer is placed after the second polarizer of the previous problem. The polarization direction of this third polarizer is oriented at 90o to that of the first polarizer. What is the intensity of the light that passes through the third polarizer? Io /16 Io /4 0 Io /8 Io /2

Io /8

A spherical mirror with a radius of curvature R has a focal length f given by: 2R R/3 R/4 R R/2

R/2

Which two of the following four statements are TRUE concerning a compound microscope? The eyepiece is used as a simple magnifying glass. The objective lens has a very short focal length. The objective lens is convex and the eyepiece is concave. Each lens produces an image that is virtual and inverted.

The eyepiece is used as a simple magnifying glass. The objective lens has a very short focal length.

Which of the following is not true for a convex mirror? The image is closer to the mirror than the object is to the mirror. The image of a real object may be virtual or real depending on the object distance. The image of a real object is never larger than the object. The image of a real object is always virtual. The image of a real object is always erect.

The image of a real object may be virtual or real depending on the object distance.

Which of the following is not true for a convex mirror? The image of a real object is never larger than the object. The image of a real object is always erect. The image of a real object may be virtual or real depending on the object distance. The image of a real object is always virtual. The image is closer to the mirror than the object is to the mirror.

The image of a real object may be virtual or real depending on the object distance.

Which of the following is not true for a diverging lens? The image of a real object is always erect. The image of a real object is always virtual. The image is closer to the lens than the object is to the lens. The image of a real object is always smaller than the object. The image of a real object may be virtual or real depending on the object distance.

The image of a real object may be virtual or real depending on the object distance.

A card marked IAHIO8 is standing upright in front of a plane mirror. Which of the following is NOT true: The image is virtual. The image shifts its position as the observer shifts his position. The image appears as 8OIHAI to a person looking in the mirror. The image is caused mostly by specular rather that diffuse reflection. The image is the same size as the object.

The image shifts its position as the observer shifts his position.

Modern motion pictures are projected at a rate of 24 frames per second. Why are you not bothered by a distracting flicker when you go to the movies? The projector divides each frame into two fields and projects each field separately. The frame rate exceeds the critical flicker fusion rate. The darkness of the theater overcomes the flicker. The projector interrupts the light at three times the frame rate. The frame rate is so much lower than the critical flicker fusion rate that it is not noticeable.

The projector interrupts the light at three times the frame rate.

Which of the following is NOT true for electromagnetic waves? They travel at different speeds in vacuum, depending of their frequency. They transport energy. They transport momentum. They can be reflected. They consist of changing electric and magnetic fields.

They travel at different speeds in vacuum, depending of their frequency.

The first measurement of the wavelengths of light was made by: Albert Michaelson. Isaac Newton. Christiaan Huygens. Albert Einstein. Thomas Young.

Thomas Young.

When light passes through two or more narrow slits, both interference and diffraction can be observed. True or False

True

The interference of light from two identical sources was first demonstrated by: Michelson-Morley Einstein Bragg Rayleigh Young

Young

Suppose you take a pencil and put its point in contact with a mirror. If the reflected pencil point does not contact the real pencil point you have: diffuse reflection a rear surface mirror a back surface mirror a front surface mirror a real image

a back surface mirror.

Suppose you take a pencil and put its point in contact with a mirror. If the reflected pencil point contacts the real pencil point you have: diffuse reflection a rear surface mirror a back surface mirror a front surface mirror a real image

a front surface mirror

Changing the shape of the eye lens to focus at different distances is called: presbyopia astigmatism accommodation adaptation stereopsis

accommodation

Which of the following is not one of the six psychological cues for depth? shade and shadow accommodation linear perspective retinal image size overlap

accommodation

The loss of color and sharpness with distance due to the scattering of light by the air is called: binocular disparity. aerial perspective. linear perspective. lateral inhibition. retinal image size disparity.

aerial perspective.

A stereo pair of images printed one on top of the other in contrasting colors that can be blocked by corresponding color filters in known as a/an: anaglyph. cyclopean image. anagram. autostereogram. telegram.

anaglyph.

A dime is viewed through a negative lens (focal length of -4.0 cm). The dime is 4 cm from the lens as seen in the figure. If the dime in the is moved closer to the lens, its image (Test 2 - No 26 image): becomes larger. becomes smaller. stays the same size. Cannot answer, not enough information is given.

becomes larger

A dime is viewed through a positive lens (focal length of + 4.0 cm). The dime is 2 cm from the lens as seen in the figure below. If the dime is moved closer to the lens, its image: (Practice Test 2 - No 4 image) stays the same size. becomes larger. becomes smaller. Cannot answer, not enough information is given.

becomes smaller.

When light incident on a surface with angle of incidence θ passes from a medium of higher index of refraction into one with a lower index, the light ray: bends toward the surface. bends toward the normal to the surface. bends away from the normal to the surface. bends out of the plane of incidence. continues without change of direction.

bends away from the normal to the surface.

When light incident on a surface with angle of incidence θ passes from a medium of lower index of refraction into one with a higher index, the light ray: continues without change of direction. bends toward the surface. bends out of the plane of incidence. bends away from the normal to the surface. bends toward the normal to the surface.

bends toward the normal to the surface.

The angle of incidence is the angle measured: between the direction of the scattered ray and the surface. normal to the surface and the surface itself. between the direction of the incident ray and the surface. between the direction of the reflected ray and the surface. between the direction of the incident ray and the normal to the surface.

between the direction of the incident ray and the normal to the surface.

The separation of viewpoints of a stereopair of images is known as: anaglyph. binocular disparity. perspective. cyclopean view. aerial perspective.

binocular disparity.

The overall illumination (measured with a light meter) is known as: lightness. lightness contrast. brightness. stereopsis. lightness constancy.

brightness

The single image formed in the brain from the separate images from the two eyes is known as the: myopic view. anaglyph view. cyclopean view. binocular disparity. aerial perspective.

cyclopean view.

An opaque disk blocks light from a point source and makes a shadow on a screen. The disk is aligned perpendicular to the path of the light and placed half-way between the light source and the screen. If the positions of the source and the disk are constant and screen is moved closer to the disk, diameter of the shadow: remains constant. gets fuzzier. increases. decreases.

decreases

Two waves moving along the same direction but exactly 1/2 wavelength out of step will display: constructive diffraction. simultaneous contrast. destructive diffraction. constructive interference. destructive interference.

destructive interference.

When you look at an object such as a car, a desk, or a vase and you see the object's shape and color, it is primarily due to: specular reflection virtual images diffuse reflection mirror reflection polarization

diffuse reflection

An object is located in front of a convex spherical mirror. As the object moves closer to the mirror its image: remains the same size inverts gets smaller gets bigger goes toward infinity

gets bigger

A person with a near point of 65 cm is considered: myopic answer not given nearly blind near sighted hyperopic

hyperopic

An opaque disk blocks light from a point source and makes a shadow on a wall due to a disk that is aligned perpendicular to the path of the light and placed half-way between the light source and the wall. If the distance between the light source and wall is kept constant, but the disk is moved closer to the source, the diameter of the disk's shadow: gets sharper. increases. remains the same size. becomes an ellipse. decreases.

increases

In the Craik-O'Brien illusion two regions of gradually changing shades of gray meet abruptly so that their junction is clearly visible. When the junction region is covered, perhaps with a pencil, the two regions then appear to be the same uniform shade of gray. This experiment tells us that our visual system is: insensitive to abrupt changes in intensity due to lateral inhibition. insensitive to gradual changes and abrupt changes in intensity. very sensitive to gradual changes but insensitive to abrupt changes in intensity. insensitive to flicker at rates above 72 Hz. insensitive to gradual changes but very sensitive to abrupt changes in intensity.

insensitive to gradual changes but very sensitive to abrupt changes in intensity.

Soap films create colors of light by: interference diffraction absorption refraction reflection

interference

A dime is viewed through a positive lens (focal length of + 4.0 cm). The dime is 2 cm from the lens as seen in the figure below. To the observer on the right, the dime appears: (Practice Test 2 - No 4 image) the same size. Cannot answer, not enough information is given. smaller. larger.

larger

Edge enhancement is a result of: lightness constancy. aerial perspective. lateral inhibition. simultaneous lightness contrast. Hermann's grid.

lateral inhibition.

The image of a real object reflected in a concave spherical mirror will be virtual and erect if the object distance is: greater than the radius of curvature of the mirror. less than the radius of curvature but more than the focal length of the mirror. greater than the focal length of the mirror. less than the focal length of the mirror. No, the image cannot be both virtual and erect.

less than the focal length of the mirror

The reflectance of a surface is know as: saturation brightness hue lightness contrast lightness

lightness

If nwater=1.50 and nglass=1.33, then total internal reflection at an interface between this glass and water: occurs whenever the light goes from glass to water. may occur when the light goes from water to glass. occurs whenever the light goes from water to glass. may occur when the light goes from glass to water. can never occur at this interface.

may occur when the light goes from water to glass.

The angle of reflection is the angle: the reflected ray makes with the plane of incidence. measured from the surface to the reflected ray. also known as the angle of refraction. measured from the normal to the reflected ray. corresponding to the deviation of the reflected ray from the incident ray.

measured from the normal to the reflected ray.

The index of refraction n is defined to be: n = v/f. n = c/v. n = f/v. n = v/c. n = f/c.

n = c/v.

The units of the index of refraction are: m/s2 s/m none of these m/s radian

none of these

In a demonstration, polarized light was shined through a column of Karo syrup. What you saw was due to: birefringence and dispersion. dispersion. optical activity. answer not given. optical activity and dispersion.

optical activity and dispersion.

A ray of light in air hits a pane of glass with parallel sides. The incident ray makes an angle θ with the normal. The light ray that emerges from the back side of glass pane is traveling: parallel to the direction of the incident ray. at an angle θ to the direction of the incident ray. at an angle -θ to the direction of the incident ray. parallel to the normal. at an angle 2θ to the direction of the incident ray.

parallel to the direction of the incident ray.

Illusions such as Pepper's Ghost are considered to be: physical illusions. psychological illusions. cognitive illusions. physiological illusions. visual illusions.

physical illusions.

The plane of incidence is the: plane perpendicular to the incident and reflected rays. reflecting plane. plane that is normal to the incident and reflected rays. mirror plane. plane that contains the incident ray and the reflected ray.

plane that contains the incident ray and the reflected ray.

Someone who requires bifocals for vision is known as: myopic hyperopic presbyopic normal astigmatic

presbyopic

Ambiguous figures like the Necker cube and Schröder's stairs are considered to be: mechanical illusions. due to lateral inhibition. physical illusions. physiological illusions. psychological illusions.

psychological illusions.

In a two lens microscope, the intermediate image is: real, inverted, and magnified. virtual, inverted, and reduced. virtual, inverted, and magnified. real, erect, and magnified. virtual, erect, and magnified.

real, inverted, and magnified.

The bending of the path of a light ray as it passes from one medium into another is known as: diffuse reflection reflection refraction the index of refraction specular reflection

refraction

The rainbow seen after a rain shower is caused by: absorption. polarization. interference. diffraction. refraction.

refraction

The image of an object seen in a plane mirror looks different from the object because it is: reversed up and down. No, it does not look different, it is exactly the same as the object. rotated about the symmetry axis. reversed left and right. reversed front to back.

reversed front to back.

The effect in which the lightness of a particular area is influenced by the lightness of surrounding regions is known as: adaptation. lightness constancy. brightness. simultaneous lightness contrast. lateral inhibition.

simultaneous lightness contrast.

A dime is viewed through a negative lens (focal length of -4.0 cm). The dime is 4 cm from the lens as seen in the figure. To the observer on the right, the dime appears: (Test 2 - No 26 image) the same size. larger. smaller. Cannot answer, not enough information is given.

smaller

When you look at an object such as a car, a desk, or a vase and you see the reflection of other objects by its surface, that is primarily due to: specular reflection virtual images diffuse reflection mirror reflection polarization

specular reflection

Which of the following is not one of the six psychological cues for depth? linear perspective stereopsis aerial perspective overlap texture gradient

stereopsis

You have seen examples of random dot stereograms. When viewed properly they revealed three-dimensional images even though neither left eye nor right eye views individually showed any image. What depth cue is used in discerning the three-dimensional image of such stereograms? stereopsis monocular movement parallax retinal image size linear perspective shade and shadow

stereopsis

Why is the sky blue? It is blue because: the air absorbs red and green light. water drops absorb red and green light. the air scatters blue light more strongly than it does red and green light. the air absorbs blue light. water drops scatter blue light more strongly than red light.

the air scatters blue light more strongly than it does red and green light.

The expression known as Snell's Law gives the relationship between: the angle of incidence and the angle of refraction. the angle of incidence and the normal. the angle of incidence and the angle of reflection. the speed of light and the index of refraction. angle of reflection and the normal.

the angle of incidence and the angle of refraction.

You can see the path of a laser beam in fog because: the droplets of water reflect the light just like a mirror. the laser light is refracted. the fog absorbs the laser light and then glows so that we can see where the laser beam passed through. the droplets of water absorb everything but the laser light. the droplets of water scatter the laser light to your eye.

the droplets of water scatter the laser light to your eye.

The statement that the angle of reflection equals the angle of incidence is known as: the law of diffraction. the law of diffuse reflection.the surface normal. the law of refraction. the surface normal. the law of reflection.

the law of reflection

Light is a: transverse mechanical wave. longitudinal electromagnetic wave. transverse electromechanical wave. transverse electromagnetic wave. longitudinal mechanical wave.

transverse electromagnetic wave

The waves that you can propagate along a rope are: longitudinal mechanical waves. longitudinal magnetic waves. transverse magnetic waves. transverse mechanical waves. transverse electromagnetic waves.

transverse mechanical waves

An opaque disk blocks light from a point source and makes a shadow on a wall. If the disk is aligned perpendicular to the path of the light and placed half-way between the light source and the wall, the diameter of its shadow is: twice the diameter of the disk. answer not given. the same size as the disk's diameter. half the diameter of the disk. four times the diameter of the disk.

twice the diameter of the disk.

When you look into a right-angle mirror oriented with the line joining the mirrors horizontal, you see yourself : as you look to others. the same as when you look into a single flat mirror. upside down. from the back. none of these.

upside down

Diffraction is best described as: reflection of waves. refraction of waves. waves bending around obstacles. absorption of waves by a medium. waves scattering off of surfaces.

waves bending around obstacles

When red light and green light are added together in roughly equal intensities, the result is yellow purple brown pink blue

yellow