Question 1

A thin lens of focal length -12.5 cm has a 5.0 cm tall object placed 10 cm in front of it.What are the size and orientation of the image?

Accepted Answer

A)  4.0 cm,inverted 
B)  4.0 cm,upright 
C)  2.8 cm,inverted 
D)  2.8 cm,upright 
E)  100 cm,inverted 
A)  4.0 cm,inverted 
B)  4.0 cm,upright 
C)  2.8 cm,inverted 
D)  2.8 cm,upright 
E)  100 cm,inverted D

Question 2

A small object is enclosed in plastic (n = 1.5).The object appears to be 4.0 cm below the surface.What is the actual distance of the object below the surface?

Accepted Answer

A)  2.0 cm 
B)  2.7 cm 
C)  4.0 cm 
D)  5.5 cm 
E)  6.0 cm 
A)  2.0 cm 
B)  2.7 cm 
C)  4.0 cm 
D)  5.5 cm 
E)  6.0 cm E

Question 3

A fish looks up at his attacker,an eagle,who is straight above the fish - though the fish lies 15cm beneath the surface of the water and the eagle is 1.5m above the surface.How far above the fish does the eagle appear to be?

Accepted Answer

A)  2.15m 
B)  2.0m 
C)  1.65m 
D)  1.5m 
A)  2.15m 
B)  2.0m 
C)  1.65m 
D)  1.5m A

Question 4

An optical fiber having index of refraction 1.40 is clad with a material of index of refraction 1.25.What is the critical angle for this fiber?

Accepted Answer

A)  63.2$^{\circ}$ 
B)  26.8$^{\circ}$ 
C)  41.8$^{\circ}$ 
D)  73.0$^{\circ}$ 
E)  16.5$^{\circ}$ 
A)  63.2$^{\circ}$ 
B)  26.8$^{\circ}$ 
C)  41.8$^{\circ}$ 
D)  73.0$^{\circ}$ 
E)  16.5$^{\circ}$

Question 5

A ray of light enters a pane of glass with an angle of incidence of 37$^{\circ}$.The index of refraction of the glass is 1.48.What is the angle of incidence on the far side of the pane of glass?

Accepted Answer

A)  21$^{\circ}$ 
B)  24$^{\circ}$ 
C)  53$^{\circ}$ 
D)  37$^{\circ}$ 
E)  16$^{\circ}$ 
A)  21$^{\circ}$ 
B)  24$^{\circ}$ 
C)  53$^{\circ}$ 
D)  37$^{\circ}$ 
E)  16$^{\circ}$

Question 6

A light ray in air strikes a glass surface with an angle of incidence of 30.0$^{\circ}$.The angle of refraction in the glass is 20.0$^{\circ}$.What is the angle between the reflected ray and the refracted ray?

Accepted Answer

A)  60$^{\circ}$ 
B)  70$^{\circ}$ 
C)  120$^{\circ}$ 
D)  130$^{\circ}$ 
E)  140$^{\circ}$ 
A)  60$^{\circ}$ 
B)  70$^{\circ}$ 
C)  120$^{\circ}$ 
D)  130$^{\circ}$ 
E)  140$^{\circ}$

Question 7

An object placed at a distance farther from a converging lens than the focal point always produces an image that is

Accepted Answer

A)  The same size as the object 
B)  Inverted 
C)  Virtual 
D)  Smaller than the object 
A)  The same size as the object 
B)  Inverted 
C)  Virtual 
D)  Smaller than the object

Question 8

If a reflected ray in air at an angle of reflection of 60$^{\circ}$is totally polarized,what is the index of refraction of the reflecting material?

Accepted Answer

A)  1.50 
B)  2.00 
C)  1.73 
D)  1.15 
E)  this angle is not possible for an incident ray in air 
A)  1.50 
B)  2.00 
C)  1.73 
D)  1.15 
E)  this angle is not possible for an incident ray in air

Question 9

A coin has been dropped inadvertently into a bucket full of cleaning fluid (n=1.13).The bottom of the bucket is 15cm beneath the top - how far beneath the surface does the washer therefore APPEAR to be?

Accepted Answer

A)  17.0cm 
B)  13.3cm 
C)  More information is needed 
D)  7.5cm 
A)  17.0cm 
B)  13.3cm 
C)  More information is needed 
D)  7.5cm

Question 10

A light ray reflects from a surface.If the angle of incidence is 24$^{\circ}$,what is the angle that the reflected ray makes with the surface?

Accepted Answer

A)  24$^{\circ}$ 
B)  12$^{\circ}$ 
C)  66$^{\circ}$ 
D)  48$^{\circ}$ 
E)  102$^{\circ}$ 
A)  24$^{\circ}$ 
B)  12$^{\circ}$ 
C)  66$^{\circ}$ 
D)  48$^{\circ}$ 
E)  102$^{\circ}$

Question 11

When a light ray in water ( n = 1.33 ) enters glass with index of refraction 1.60,what is the greatest angle of refraction that can occur?

Accepted Answer

A)  90.0$^{\circ}$ 
B)  56.2$^{\circ}$ 
C)  52.2$^{\circ}$ 
D)  38.7$^{\circ}$ 
E)  0.0$^{\circ}$ 
A)  90.0$^{\circ}$ 
B)  56.2$^{\circ}$ 
C)  52.2$^{\circ}$ 
D)  38.7$^{\circ}$ 
E)  0.0$^{\circ}$

Question 12

A ray of light enters a pane of glass with an angle of incidence of 37$^{\circ}$.The index of refraction of the glass is 1.48.What is the angle of refraction as the ray emerges from the other side of the pane?

Accepted Answer

A)  21$^{\circ}$ 
B)  24$^{\circ}$ 
C)  53$^{\circ}$ 
D)  37$^{\circ}$ 
E)  16$^{\circ}$ 
A)  21$^{\circ}$ 
B)  24$^{\circ}$ 
C)  53$^{\circ}$ 
D)  37$^{\circ}$ 
E)  16$^{\circ}$

Question 13

A ray of light enters an equilateral prism made of material with n = 1.45 at an angle of incidence $\theta$. The internally refracted ray is parallel to the base of the prism.What is the angle of refraction for the ray leaving the prism?

Accepted Answer

A)  46.5$^{\circ}$ 
B)  30.0$^{\circ}$ 
C)  20.2$^{\circ}$ 
D)  15.7$^{\circ}$ 
E)  the ray won't leave the prism 
A)  46.5$^{\circ}$ 
B)  30.0$^{\circ}$ 
C)  20.2$^{\circ}$ 
D)  15.7$^{\circ}$ 
E)  the ray won't leave the prism

Question 14

What is the least value for an index of refraction?

Accepted Answer

A)  0 
B)  0.5 
C)  1 
D)  just less than 1 
E)  (1/2)1/2 
A)  0 
B)  0.5 
C)  1 
D)  just less than 1 
E)  (1/2)1/2

Question 15

A light ray in air strikes a glass surface with an angle of incidence of 30.0$^{\circ}$.The angle of refraction in the glass is 20.0$^{\circ}$.What is the speed of light in the glass?

Accepted Answer

A)  3.00 $\times$ 108 m/s 
B)  2.50 $\times$ 108 m/s 
C)  2.33 $\times$ 108 m/s 
D)  2.05 $\times$ 108 m/s 
E)  1.50 $\times$ 108 m/s 
A)  3.00 $\times$ 108 m/s 
B)  2.50 $\times$ 108 m/s 
C)  2.33 $\times$ 108 m/s 
D)  2.05 $\times$ 108 m/s 
E)  1.50 $\times$ 108 m/s

Question 16

A ray of light enters an equilateral prism made of material with n = 1.45 at an angle of incidence $\theta$.The internally refracted ray is parallel to the base of the prism.What is the angle of refraction for the ray leaving the prism?

Accepted Answer

A)  46.5$^{\circ}$ 
B)  30.0$^{\circ}$ 
C)  20.2$^{\circ}$ 
D)  15.7$^{\circ}$ 
E)  the ray won't leave the prism 
A)  46.5$^{\circ}$ 
B)  30.0$^{\circ}$ 
C)  20.2$^{\circ}$ 
D)  15.7$^{\circ}$ 
E)  the ray won't leave the prism

Question 17

It is found that at a laser bounced off the surface of a liquefied gas is perfectly polarized when the angle of incidence of the laser beam is 45.7 degrees from the vertical.What is the index of refraction of this material?

Accepted Answer

A)  1.43 
B)  1.397 
C)  1.412 
D)  1.091 
E)  1.025 
A)  1.43 
B)  1.397 
C)  1.412 
D)  1.091 
E)  1.025

Question 18

An innovative physics professor conducts laboratory exercises in the college swimming pool.Suppose that one exercise was the measurement of the degree of polarization by bouncing laser light off the vertically-oriented transparent polycarbonate side wall of the pool.The laser is shone on the pool wall at an angle of 42 degrees with respect to the vertical,and at that angle the reflected ray is perfectly polarized.What is the index of refraction of the material? It will help to recall that the index of refraction of water is 1.33.

Accepted Answer

A)  1.11 
B)  1.28 
C)  1.20 
D)  1.48 
A)  1.11 
B)  1.28 
C)  1.20 
D)  1.48

Question 19

The image formed by a diverging lens of a real object is always

Accepted Answer

A)  Smaller than the object 
B)  Inverted 
C)  Larger than the object 
D)  Virtual 
E)  Real 
A)  Smaller than the object 
B)  Inverted 
C)  Larger than the object 
D)  Virtual 
E)  Real

Question 20

Fiber optic cable is in the form of a cylinder of fiber with index of refraction 1.67 and cladding around the outside of index of refraction 1.45.What is the maximum angle for light rays inside the fiber with respect to the cable's axis for which the light will be fully transmitted thanks to total internal reflection?

Accepted Answer

A)  30$^{\circ}$ 
B)  60$^{\circ}$ 
C)  41$^{\circ}$ 
D)  49$^{\circ}$ 
A)  30$^{\circ}$ 
B)  60$^{\circ}$ 
C)  41$^{\circ}$ 
D)  49$^{\circ}$

Exam 23: Reflection and Refraction of Light

A thin lens of focal length -12.5 cm has a 5.0 cm tall object placed 10 cm in front of it.What are the size and orientation of the image?

A small object is enclosed in plastic (n = 1.5).The object appears to be 4.0 cm below the surface.What is the actual distance of the object below the surface?

A fish looks up at his attacker,an eagle,who is straight above the fish - though the fish lies 15cm beneath the surface of the water and the eagle is 1.5m above the surface.How far above the fish does the eagle appear to be?

An optical fiber having index of refraction 1.40 is clad with a material of index of refraction 1.25.What is the critical angle for this fiber?

A ray of light enters a pane of glass with an angle of incidence of 37 ∘^{\circ}∘ .The index of refraction of the glass is 1.48.What is the angle of incidence on the far side of the pane of glass?

A light ray in air strikes a glass surface with an angle of incidence of 30.0 ∘^{\circ}∘ .The angle of refraction in the glass is 20.0 ∘^{\circ}∘ .What is the angle between the reflected ray and the refracted ray?

An object placed at a distance farther from a converging lens than the focal point always produces an image that is

If a reflected ray in air at an angle of reflection of 60 ∘^{\circ}∘ is totally polarized,what is the index of refraction of the reflecting material?

A coin has been dropped inadvertently into a bucket full of cleaning fluid (n=1.13).The bottom of the bucket is 15cm beneath the top - how far beneath the surface does the washer therefore APPEAR to be?

A light ray reflects from a surface.If the angle of incidence is 24 ∘^{\circ}∘ ,what is the angle that the reflected ray makes with the surface?

When a light ray in water ( n = 1.33 ) enters glass with index of refraction 1.60,what is the greatest angle of refraction that can occur?

A ray of light enters a pane of glass with an angle of incidence of 37 ∘^{\circ}∘ .The index of refraction of the glass is 1.48.What is the angle of refraction as the ray emerges from the other side of the pane?

A ray of light enters an equilateral prism made of material with n = 1.45 at an angle of incidence θ\thetaθ . The internally refracted ray is parallel to the base of the prism.What is the angle of refraction for the ray leaving the prism?

What is the least value for an index of refraction?

A light ray in air strikes a glass surface with an angle of incidence of 30.0 ∘^{\circ}∘ .The angle of refraction in the glass is 20.0 ∘^{\circ}∘ .What is the speed of light in the glass?

A ray of light enters an equilateral prism made of material with n = 1.45 at an angle of incidence θ\thetaθ .The internally refracted ray is parallel to the base of the prism.What is the angle of refraction for the ray leaving the prism?

It is found that at a laser bounced off the surface of a liquefied gas is perfectly polarized when the angle of incidence of the laser beam is 45.7 degrees from the vertical.What is the index of refraction of this material?

The image formed by a diverging lens of a real object is always

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A ray of light enters a pane of glass with an angle of incidence of 37 $^{\circ}$ .The index of refraction of the glass is 1.48.What is the angle of incidence on the far side of the pane of glass?

A light ray in air strikes a glass surface with an angle of incidence of 30.0 $^{\circ}$ .The angle of refraction in the glass is 20.0 $^{\circ}$ .What is the angle between the reflected ray and the refracted ray?

If a reflected ray in air at an angle of reflection of 60 $^{\circ}$ is totally polarized,what is the index of refraction of the reflecting material?

A light ray reflects from a surface.If the angle of incidence is 24 $^{\circ}$ ,what is the angle that the reflected ray makes with the surface?

A ray of light enters a pane of glass with an angle of incidence of 37 $^{\circ}$ .The index of refraction of the glass is 1.48.What is the angle of refraction as the ray emerges from the other side of the pane?

A light ray in air strikes a glass surface with an angle of incidence of 30.0 $^{\circ}$ .The angle of refraction in the glass is 20.0 $^{\circ}$ .What is the speed of light in the glass?