physics test

Light from a 600 nm source goes through two slits 0.080 mm apart. What is the angular separation of the two first order maxima occurring on a screen?

0.86°

Light of wavelength 687 nm is incident on a single slit 0.75 mm wide. At what distance from the slit should a screen be placed if the second dark fringe in the diffraction pattern is to be 1.7 mm from the center of the screen?

0.93 m

The side mirror on a car is convex and has a radius of curvature of 25 cm. Another car is following, 20 m behind the mirror. If the height of the car is 1.6 m, how tall is the image?

1 cm

In a two-slit experiment, the third bright fringe away from the central fringe is observed at an angle of 7.0°. If the wavelength of the light is 490 nm, what is the distance between the two slits?

1.2 × 10-5 m

How far are you from your image when you stand 0.75 m in front of a vertical plane mirror?

1.5 m

The critical angle for a particular type of glass is 39.0°. What is the index of refraction of the glass?

1.59

In a Young's double slit experiment, the separation between the two slits is 0.040 mm and the beam of light has a wavelength of 650 nm. Find the angular separation between the central bright fringe and second order bright fringe?

1.9°

You run directly towards a plane mirror at 5 m/s. How fast do you approach your image?

10 m/s

A concave mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?

15 cm

Light of wavelength 575 nm falls on a double-slit and the third order bright fringe is seen at an angle of 6.5°. What is the separation between the double slits?

15 μm

An object is placed 10 cm from a convex lens of focal length 20 cm. What is the magnification?

2.0

An image is 4.0 mm in front of a converging lens with focal length 5.0 mm. Where is the object?

2.2 mm in front of the lens

A object is 12 cm in front of a concave mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirror?

2.4 cm

The focal length of a magnifying glass is 15 cm. If the near point of a person is 25 cm, what is the magnification of this glass for this person when his eyes are focused at infinity?

2.7

What power contact lens should be used to correct the vision of a farsighted person whose near point is 80 cm to see something clearly at a distance of 25 cm?

2.8 diopters

A mirror with a focal length -25 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image?

20 cm behind the mirror

A mirror with a focal length 100 cm has a 4.0 cm object placed 20 cm in front of it. What is the position of the image?

25 cm behind the mirror

A light ray in air enters water at an angle of incidence of 40°. Water has an index of refraction of 1.33. The angle of refraction in the water is

29°

Light of wavelength 580 nm is incident on a slit of width 0.300 mm. An observing screen is placed 2.00 m from the slit. Find the position of the first order dark fringe from the center of the screen.

3.9 mm

If light of wavelength 700 nm is sent through a slit of width of 5.0 μm, at what angle from the central maximum is the 4th order minimum?

34°

John's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and upright, what is the focal length of the mirror?

40 cm

An object 4.0 cm in height is placed 8.0 cm in front of a concave mirror with a focal length of 10.0 cm. What is the position of its image in relation to the mirror and what are its characteristics?

40.0 cm on the other side of mirror, virtual, 5.0 times bigger

The critical angle for glass in air if the glass has index of refraction 1.50 is

41.8°

A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm?

5.0

A beam of light in water (n = 1.33) enters a glass slab (n = 1.50) at an angle of incidence of 60.0°. What is the angle of refraction?

50.2°

A light ray in water passes into air. The angle of incidence in the water is 40°. What is the angle of refraction in air if the index of refraction of water is 1.33?

59°

An object is 12 cm in front of a converging lens with focal length 4 cm. Where is the image?

6.0 cm behind the lens

What is the critical angle for light traveling from crown glass (n = 1.52) into water (n = 1.33)?

61°

A slit of width 0.01 mm has light of wavelength 600 nm passing through it onto a screen 60 cm away. How wide (in cm) is the central maximum?

7.2 cm

If the 5th order minimum in the diffraction pattern is at 40°, at what angle is the 1st order minimum?

7.4°

A laser beam strikes a plane's reflecting surface with an angle of incidence of 43°. What is the angle between the incident ray and the reflected ray?

86°

An object is placed 12 cm in front of a curved mirror. The magnification of the image is -3.0. What is the focal length of the mirror?

9.0 cm

A 4.0-cm-tall object is placed 50.0 cm from a diverging lens of focal length 25.0 cm. What is the nature and location of the image?

A virtual image, 1.3 cm tall, 16.7 cm same side as the object.

A 4.0 cm tall object is placed 60 cm away from a converging lens of focal length 30 cm. What is the nature and location of the image?

The image is virtual, 4.0 cm tall, 60 cm on the same side as object.

Two beams of coherent light travel different paths arriving at point P. If the maximum constructive interference is to occur at point P, what should be the phase difference between the two waves?

The phase difference between the two waves is 2π.

Two beams of coherent light travel different paths arriving at point P. If the maximum destructive interference is to occur at point P, what should be the phase difference between the two waves?

The phase difference between the two waves is π.

Waves that are emitted in phase from two sources will undergo constructive interference when the paths from the sources differ by

a whole integer number of wavelengths.

An image formed when the light rays pass through the image location, and could appear on paper or film placed at that location is referred to as a(n)

real image.

An index of refraction less than one for a medium would imply

that the speed of light in the medium is greater than the speed of light in vacuum.

The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence greater than this angle will be

totally reflected.

An image formed when the light rays do not actually pass through the image location, and would not appear on paper or film placed at that location is referred to as a(n)

virtual image.

An object is placed 21 cm from a concave lens of focal length 25 cm. What is the magnification?

0.54

A single slit, which is 0.050 mm wide, is illuminated by light of 550 nm wavelength. What is the angular separation between the first two minima on either side of the central maximum?

0.63°

John is nearsighted and cannot see things beyond 90 cm from his eyes. What is the refractive power of the contact lenses that will enable him to see distant objects clearly?

+1.1 diopters

Jill is farsighted and cannot see objects clearly that are closer to the eye than 80.0 cm. What is the refractive power of the contact lenses that will enable her to see objects at a distance of 25.0 cm from her eyes?

+2.75 diopters

An object is placed 50 cm in front of a concave mirror with a focal length of 25 cm. What is the magnification?

-1.0

A mirror with a focal length 20 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the height of the image?

-1.0 cm

A nearsighted person has a far point that is 4.2 m from his eyes. What focal length lenses in diopters he must use in his contacts to allow him to focus on distant objects?

0.48 diopters

Waves that are emitted in phase from two sources will undergo destructive interference when the paths from the sources differ by

an odd half-integer number of wavelengths.

Plane mirrors produce images which

are always the same size as the actual object.

A convex lens has focal length f. An object is located at infinity. The image formed is located

at f.

A convex lens has a focal length f. An object is placed at f on the axis. The image formed is located

at infinity.

The image formed in a plane mirror is

at the same distance behind the mirror as the object is in front of the mirror.

A lens of focal length 20 cm has an object of height 3.0 cm placed 100 cm in front of it. The image formed is

inverted and smaller than the object.

When light enters a material of higher index of refraction, its speed

decreases.

What principle is responsible for light spreading as it passes through a narrow slit?

diffraction

The spreading of white light into its spectrum is called

dispersion.

How tall must a plane mirror be in order for you to be able to see your full image in it?

half of your height.

What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits?

interference