Question 1

When a light ray travels between any two points,the path it takes is the one that (Hint: Eliminate answers you know are wrong. )

Accepted Answer

A) covers the greatest distance. 
B) follows the greatest index of refraction. 
C) avoids travel in more than one medium. 
D) is the mean between the longest and the shortest paths. 
E) takes the least time. 
A) covers the greatest distance. 
B) follows the greatest index of refraction. 
C) avoids travel in more than one medium. 
D) is the mean between the longest and the shortest paths. 
E) takes the least time.

Question 2

Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface.The edges of the two mirrors meet at a 30° angle.A light ray that approaches mirror 1 is parallel to mirror 2.The angle of reflection of that ray from mirror 1 is

Accepted Answer

A) 0°. 
B) 30°. 
C) 60°. 
D) 90°. 
E) 120°. 
A) 0°. 
B) 30°. 
C) 60°. 
D) 90°. 
E) 120°.

Question 3

Light can exhibit the characteristics of

Accepted Answer

A) a particle with energy E = hf. 
B) a wave with wavelength   . 
C) a particle or wave that travels at speed   in all materials. 
D) all of the above. 
E) only (a)or (b)above. 
A) a particle with energy E = hf. 
B) a wave with wavelength   . 
C) a particle or wave that travels at speed   in all materials. 
D) all of the above. 
E) only (a)or (b)above.

Question 4

The angle between two plane mirrors that meet at one edge is 45°.The change in direction of a ray that strikes the first mirror at a 60° angle of incidence when that ray reflects from the second mirror is

Accepted Answer

A) 0°. 
B) 45° 
C) 90° 
D) 150° 
E) 270° 
A) 0°. 
B) 45° 
C) 90° 
D) 150° 
E) 270°

Question 5

Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface.The edges of the two mirrors meet at a 30° angle.A light ray that enters parallel to mirror 2 reflects from mirror 1 and then from mirror 2.The angle of reflection of that ray from mirror 2 is

Accepted Answer

A) 0°. 
B) 30°. 
C) 60°. 
D) 90°. 
E) 120°. 
A) 0°. 
B) 30°. 
C) 60°. 
D) 90°. 
E) 120°.

Question 6

A light ray is incident on the surface of water (n = 1.33)at an angle of 60° relative to the normal to the surface.The angle of the reflected wave is

Accepted Answer

A) 80° 
B) 40° 
C) 20° 
D) 60° 
E) 30° 
A) 80° 
B) 40° 
C) 20° 
D) 60° 
E) 30°

Question 7

Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface.A light ray that reflects from mirror 1 at angle θM1 then strikes the second mirror and reflects at θM2 such that the angle between the ray reaching mirror 1 and the ray leaving mirror 2 is 180°.The angle between the two mirrors is

Accepted Answer

A) 0°. 
B) 45°. 
C) 90°. 
D) 150°. 
E) 235°. 
A) 0°. 
B) 45°. 
C) 90°. 
D) 150°. 
E) 235°.

Question 8

A light ray is partially reflected and partially refracted at a boundary between two media,the upper one having index of refraction n,the lower one having index of refraction n',as shown in the figure.The reflected ray is perpendicular to the refracted ray when

Accepted Answer

A)    . 
B)    . 
C)    . 
D)    . 
E)    . 
A)    . 
B)    . 
C)    . 
D)    . 
E)    .

Question 9

A layer of water (n = 1.333)floats on carbon tetrachloride (n = 1.461)contained in an aquarium.To the nearest degree,what is the critical angle at the interface between the two liquids?

Accepted Answer

A) 88° 
B) 78° 
C) 66° 
D) 58° 
E) 43° 
A) 88° 
B) 78° 
C) 66° 
D) 58° 
E) 43°

Question 10

An experiment to measure the speed of light uses an apparatus similar to Fizeau's.The distance between the light source and the mirror is 10 m,and the wheel has 800 notches.If the wheel rotates at 9000 rev/s when the light from the source is extinguished,what is the experimental value for c (in m/s)?

Accepted Answer

A) 2.94 × 108 
B) 2.92 × 108 
C) 2.88 × 108 
D) 2.98 × 108 
E) 3.01 × 108 
A) 2.94 × 108 
B) 2.92 × 108 
C) 2.88 × 108 
D) 2.98 × 108 
E) 3.01 × 108

Question 11

A laser beam is incident from the air at an angle of 30.00° to the vertical onto a solution of Karo syrup in water.If the beam is refracted to 19.24° to the vertical,what is the index of refraction of the syrup solution?

Accepted Answer

The answer of A laser beam is incident from the...

Question 12

The index of refraction for red light in water is 1.331 and for blue light is 1.340.If a ray of white light enters the water at an angle of incidence of 83.00°,what are the underwater angles of refraction for the blue and red components of the light?

Accepted Answer

47.79° (bl

Question 13

A monochromatic (single frequency,single wavelength)light ray in air (n = 1)enters a glass prism (n = 1.5).In the glass prism

Accepted Answer

A) both the frequency and the wavelength are the same as in air 
B) the frequency is the same,but the wavelength is greater than in air. 
C) the frequency is the same,but the wavelength is smaller than in air. 
D) the wavelength is the same,but the frequency is greater than in air. 
E) the wavelength is the same,but the frequency is smaller than in air. 
A) both the frequency and the wavelength are the same as in air 
B) the frequency is the same,but the wavelength is greater than in air. 
C) the frequency is the same,but the wavelength is smaller than in air. 
D) the wavelength is the same,but the frequency is greater than in air. 
E) the wavelength is the same,but the frequency is smaller than in air.

Question 14

When light is either reflected or refracted,the quantity that does not change in either process is its

Accepted Answer

A) direction of travel. 
B) dispersion. 
C) frequency. 
D) speed. 
E) wavelength. 
A) direction of travel. 
B) dispersion. 
C) frequency. 
D) speed. 
E) wavelength.

Question 15

Light strikes a diamond (n = 2.42)at an angle of 60° relative to the normal to the surface.What is the angle of refraction?

Accepted Answer

A) 21° 
B) 30° 
C) 38° 
D) 69° 
E) 71° 
A) 21° 
B) 30° 
C) 38° 
D) 69° 
E) 71°

Question 16

A light ray whose frequency is 6.00 × 1014 Hz in vacuum is incident on water (n = 1.33).The wavelength of the light after it enters the water is (in nm)

Accepted Answer

A) 798 
B) 500 
C) 665 
D) 376 
E) 266 
A) 798 
B) 500 
C) 665 
D) 376 
E) 266

Question 17

The speed of light changes when it goes from ethyl alcohol (n = 1.36)to carbon tetrachloride (n = 1.46).The ratio of the speed in carbon tetrachloride to the speed in ethyl alcohol,v2/v1,is

Accepted Answer

A) 1.99 
B) 1.07 
C) 0.932 
D) 0.511 
E) 0.760 
A) 1.99 
B) 1.07 
C) 0.932 
D) 0.511 
E) 0.760

Question 18

The first successful measurement of the speed of light was made by

Accepted Answer

A) Rene Descartes. 
B) Armand Fizeau. 
C) Christian Huygens. 
D) Ole Roemer. 
E) James Maxwell. 
A) Rene Descartes. 
B) Armand Fizeau. 
C) Christian Huygens. 
D) Ole Roemer. 
E) James Maxwell.

Exam 35: The Nature of Light and the Principles of Ray Optics

When a light ray travels between any two points,the path it takes is the one that (Hint: Eliminate answers you know are wrong. )

Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface.The edges of the two mirrors meet at a 30° angle.A light ray that approaches mirror 1 is parallel to mirror 2.The angle of reflection of that ray from mirror 1 is

Light can exhibit the characteristics of

The angle between two plane mirrors that meet at one edge is 45°.The change in direction of a ray that strikes the first mirror at a 60° angle of incidence when that ray reflects from the second mirror is

A light ray is incident on the surface of water (n = 1.33)at an angle of 60° relative to the normal to the surface.The angle of the reflected wave is

A light ray is partially reflected and partially refracted at a boundary between two media,the upper one having index of refraction n,the lower one having index of refraction n',as shown in the figure.The reflected ray is perpendicular to the refracted ray when

A layer of water (n = 1.333)floats on carbon tetrachloride (n = 1.461)contained in an aquarium.To the nearest degree,what is the critical angle at the interface between the two liquids?

A laser beam is incident from the air at an angle of 30.00° to the vertical onto a solution of Karo syrup in water.If the beam is refracted to 19.24° to the vertical,what is the index of refraction of the syrup solution?

The index of refraction for red light in water is 1.331 and for blue light is 1.340.If a ray of white light enters the water at an angle of incidence of 83.00°,what are the underwater angles of refraction for the blue and red components of the light?

A monochromatic (single frequency,single wavelength)light ray in air (n = 1)enters a glass prism (n = 1.5).In the glass prism

When light is either reflected or refracted,the quantity that does not change in either process is its

Light strikes a diamond (n = 2.42)at an angle of 60° relative to the normal to the surface.What is the angle of refraction?

A light ray whose frequency is 6.00 × 1014 Hz in vacuum is incident on water (n = 1.33).The wavelength of the light after it enters the water is (in nm)

The speed of light changes when it goes from ethyl alcohol (n = 1.36)to carbon tetrachloride (n = 1.46).The ratio of the speed in carbon tetrachloride to the speed in ethyl alcohol,v2/v1,is

The first successful measurement of the speed of light was made by

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A light ray whose frequency is 6.00 × 10¹⁴ Hz in vacuum is incident on water (n = 1.33).The wavelength of the light after it enters the water is (in nm)

The speed of light changes when it goes from ethyl alcohol (n = 1.36)to carbon tetrachloride (n = 1.46).The ratio of the speed in carbon tetrachloride to the speed in ethyl alcohol,v₂/v₁,is