Physical Science CH 7

Which of the following statements is true of the angles of incidence and reflection? a. They are not related b. They can never be equal c. They are always equal d. They add to 90°.

They are always equal

An object is placed 5 cm to the left of a converging spherical lens. The lens has a focal length of f = 10 cm. What kind of image is formed and what is its orientation? a. Real/Upright b. Virtual/Upright c. Virtual/Inverted d. Real/Inverted

Virtual/Upright

A lens that is thicker at the edge than at the center is a. a diverging lens only. b. a convex lens only. c. a converging lens only. d. both a convex lens and a converging lens.

a diverging lens only.

An example of a diverging spherical mirror is a. a bathroom mirror. b. a round Christmas tree ornament. c. a flashlight reflector. d. none of these.

a round Christmas tree ornament.

The image formed by a diverging spherical lens is always a. upright b. reduced c. virtual d. all of these

all of these

The law of reflection applies to a. specular reflection b. diffuse reflection c. irregular reflection. d. all of these

all of these

The angles of incidence and reflection a. are not related. b. can never be equal. c. are measured from a normal to the reflecting surface. d. add to 90°.

are measured from a normal to the reflecting surface.

A lens that is thicker at the center than at the edge is a. a diverging lens only. b. a convex lens only. c. a converging lens only. d. both a convex lens and a converging lens.

both a convex lens and a converging lens.

A rainbow results from a. both reflection and refraction. b. refraction only c. neither reflection nor refraction. d. reflection only.

both reflection and refraction.

All real images a. cannot be focused on a screen. b. are erect. c. can be focused on a screen. d. are inverted.

can be focused on a screen.

The photoreceptors responsible for color vision are called a. rods b. cylinders c. cones d. cans

cones

The bending of light rays around corners is called a. reflection b. refraction c. interference d. diffraction

diffraction

The change in the direction of a wave resulting from its encountering a small slit is known as a. interference b. diffraction c. reflection d. polarization

diffraction

A flashlight beam is seen because of a. specular reflection. b. diffuse reflection. c. dispersion. d. refraction.

diffuse reflection.

The separation of white light into its component colors is called a. polarization b. diffraction c. dispersion d. refraction

dispersion

The index of refraction of transparent materials is a. equal to 1. b. greater than 1. c. less than 1. d. any of these.

greater than 1.

The angle of incidence of a light wave is a. different depending on whether there is diffuse or specular reflection. b. measured from a normal to the surface. c. equal to the angle of refraction. d. measured relative to the surface of the material.

measured from a normal to the surface.

A liquid crystal display (LCD) using a "twisting" effect in the display involves a. polarization b. interference c. refraction d.

polarization

A(n) ______________ image is defined as one that can be brought to a focus on a screen. a. virtual b. real c. upright d. inverted

real

The photoreceptors responsible for "twilight" vision are called a. rods b. cylinders c. cones d. cans

rods

The trapping of light in "light pipes," or fiber optics, is due to a. total internal reflection. b. refraction c. absorption of the outside light. d. diffraction.

total internal reflection.

A(n) ______________ image is defined as one that cannot be brought to a focus on a screen. a. virtual b. real c. upright d. inverted

virtual

The speed of light in a material is 1.74 × 108 m/s. What is the index of refraction of this material? a. 1.72 b. 0.58 c. 1.74 d. 0.218

1.72

An object is placed 10 cm to the left of a converging spherical lens. The lens has a focal length of f = 5 cm. Where is the image formed? a. 3.3 cm to the left of the lens b. 3.3 cm to the right of the lens c. 10 cm to the left of the lens d. 10 cm to the right of the lens

10 cm to the right of the lens

For normal vision, an object can be seen clearly when it is beyond the a. far point. b. nearsighted point. c. farsighted point. d. near point.

near point.

A visual defect wherein a person can see nearby objects clearly but not distant objects is called a. dispersion b. destructive interference c. farsightedness d. nearsightedness

nearsightedness

A reflected ray of light leaves a plane mirror's surface at an angle of 30° relative to the normal. The angle of incidence was a. 30° relative to the surface. b. 60° relative to the normal. c. 90° from the surface. d. none of these.

none of these.

A concave mirror will produce a. only inverted images. b. real or virtual images. c. only virtual images. d. only real images.

real or virtual images.

For total internal reflection, light is ______________ and none is ______________. a. reflected, refracted b. refracted; transmitted c. transmitted, refracted d. transmitted; reflected

reflected, refracted

For total internal reflection, light is ______________ and none is ______________. a. refracted; reflected b. refracted; transmitted c. reflected; transmitted d. transmitted; reflected

reflected; transmitted

A pencil partially submerged in a glass of water appears broken or offset because of a. polarization b. diffraction c. interference d. refraction

refraction

Images of objects are formed by lenses because of a. refraction b. diffraction c. internal reflection d. all of these.

refraction

The observation of a "wet spot" on a hot highway in the summer is caused by a. dispersion b. diffraction c. refraction d. reflection

refraction

The ratio of the speed of light in a vacuum to the speed of light in a medium is known as the index of a. reflection b. refraction c. diffraction d. none of these

refraction

When the Sun is on the horizon, it is actually lower than it appears because of a. refraction b. dispersion c. scattering d. reflection

refraction

The bending of light because of a speed change as it moves from one medium to another is called a. diffraction. b. refraction. c. reflection. d. the Doppler effect.

refraction.

The image of a real object formed by a single converging lens cannot be a. real, inverted, and enlarged. b. real, inverted, and the same size as the object. c. virtual, upright, and enlarged. d. real, inverted, and reduced. e. virtual, upright, and reduced.

virtual, upright, and reduced.

The image of a convex mirror is always a. virtual, inverted, and larger. b. virtual, upright, and smaller. c. real, upright, and smaller. d. real, inverted, and larger.

virtual, upright, and smaller.

The least diffraction occurs for a. λ < d. b. λ = d. c. λ > d. d. none of these; that is, it makes no difference.

λ < d.

The greatest diffraction occurs for a. λ < d. b. λ = d. c. λ > d. d. none of these; that is, it makes no difference.

λ > d.

Light for which the electric field vector is restricted to one plane is said to be a. linearly polarized. b. linearly refracted. c. linearly reflected. d. unpolarized.

linearly polarized.

A light wave traveling in air strikes a plane mirror surface at an angle of 30° relative to the normal. The wave is reflected at an angle of a. 30° relative to the surface. b. 30° relative to the normal. c. 60° relative to the normal. d. none of these.

30° relative to the normal.

A particular material has an index of refraction of 2.75. What percent of the speed of light in vacuum is the speed of light in the material? a. 36% b. 10% c. 8% d. 89%

36%

The speed of light in a particular transparent medium is 2/8 the speed of light in a vacuum. What is the index of refraction of the material? a. 1.3 b. 0.75 c. 4 d. 0.25

4

A reflected ray of light leaves a plane mirror's surface at an angle of 60° relative to the normal. The angle of incidence was a. 60° relative to the surface. b. 60° relative to the normal. c. 90° from the surface. d. none of these.

60° relative to the normal.

An object is placed 5 cm to the left of a converging spherical lens. The lens has a focal length of f = 15 cm. Where is the image formed and what kind of image is formed? a. 7.5 cm to the right of the lens, Real b. 7.5 cm to the left of the lens, Virtual c. 7.5 cm to the right of the lens, Virtual d. 7.5 cm to the left of the lens, Real

7.5 cm to the left of the lens, Virtual

The law of reflection a. applies only to plane mirrors. b. is limited to regular reflection. c. must be modified for diffuse reflection. d. applies to all reflecting surfaces.

applies to all reflecting surfaces.

If a ray of light passes from air into glass, the light will a. travel along the normal b. bend toward the normal c. bend away from the normal d. continue traveling in the same direction

bend toward the normal

The bending of waves around corners is called a. reflection b. refraction c. diffraction d. interference

diffraction

A diverging lens produces an image of a real object. This image is a. reduced, upright, and virtual. b. enlarged, inverted, and real. c. reduced, inverted, and virtual. d. enlarged, upright, and real. e. enlarged, upright, and virtual.

enlarged, upright, and virtual.

A visual defect wherein a person can see distant objects clearly but not nearby objects is called a. dispersion b. destructive interference c. farsightedness d. nearsightedness

farsightedness

An example of a converging spherical mirror is a a. flashlight reflector. b. bathroom mirror. c. spherical truck mirror. d. hubcap.

flashlight reflector

If a ray of light passes from air into glass, the angle of incidence will be a. less than the angle of refraction. b. sometimes greater and sometimes less than the angle of refraction. c. greater than the angle of refraction. d. equal to the angle of refraction.

greater than the angle of refraction.

An object is placed at the center of curvature of a concave mirror. The image is a. inverted, real, and the same size as the object. b. virtual and the same size as the object. c. virtual and smaller than the object. d. virtual and enlarged. e. erect, real, and the same size as the object.

inverted, real, and the same size as the object.

The image of an object at the focal point of a concave spherical mirror a. looks the same as the object. b. is said to be formed at infinity. c. is real. d. is reduced.

is said to be formed at infinity.

A ray of light in water strikes an air-water interface at an angle of incidence greater than the critical angle. The ray a. emerges but is bent away from the normal. b. travels along the interface. c. emerges but is bent toward the normal. d. is totally reflected into the water.

is totally reflected into the water.

A ray of light in water strikes an air-water interface at an angle of incidence greater than the critical angle. The ray a. emerges but is bent away from the normal. b. travels along the interface. c. emerges but is bent toward the normal. d. is totally reflected into the water.

is totally reflected into the water.

When light enters a denser medium and is refracted, a. the wavelength is unchanged. b. the wave speed increases. c. the frequency is unchanged. d. the wavelength increases.

the frequency is unchanged.

Dispersion occurs in a medium because a. the index of refraction depends on wave amplitude. b. of regular reflection. c. of diffuse reflection. d. the index of refraction depends on the wavelength.

the index of refraction depends on the wavelength.

Polarization involves a. the orientation of field vectors. b. only longitudinal waves. c. diffraction. d. interference.

the orientation of field vectors.