Question 1

As light passes from one medium into another,the angle of refraction is _____ in the medium with the _____ index of refraction and _____ speed of light.

Accepted Answer

A) smaller; larger; lower 
B) smaller; larger; higher 
C) larger; smaller; lower 
D) larger; larger; lower 
E) smaller; smaller; higher 
A) smaller; larger; lower 
B) smaller; larger; higher 
C) larger; smaller; lower 
D) larger; larger; lower 
E) smaller; smaller; higher

Question 2

Ultra fast pulse lasers can emit pulses of the order 10 fs.If each pulse that is 10 fs long and the wavelength of the laser is 500 nm,the number of wavelengths in each pulse is

Accepted Answer

A) 6 
B) 10 
C) 12 
D) 50 
E) 120 
A) 6 
B) 10 
C) 12 
D) 50 
E) 120

Question 3

Light is incident at an angle of 60S1U1P1$\circ$S1S1P0 at an air to glass interface.If the angle of refraction inside the glass is 32S1U1P1$\circ$S1S1P0,then calculate the speed of light within the glass.

Accepted Answer

A) 3.00 $\times$ 108 m/s 
B) 1.77 $\times$ 108 m/s 
C) 4.90 $\times$ 108 m/s 
D) 1.84 $\times$ 108 m/s 
E) 1.62 $\times$ 108 m/s 
A) 3.00 $\times$ 108 m/s 
B) 1.77 $\times$ 108 m/s 
C) 4.90 $\times$ 108 m/s 
D) 1.84 $\times$ 108 m/s 
E) 1.62 $\times$ 108 m/s

Question 4

The minimum angle of deviation produced by a glass prism (n = 1.70 for the light used)whose apex angle is 45º is approximately

Accepted Answer

A) 32º 
B) 36º 
C) 26º 
D) 18º 
E) 45º 
A) 32º 
B) 36º 
C) 26º 
D) 18º 
E) 45º

Question 5

Use the following figure for the next problem.  
-An object leaves point A and travels in a straight line to point B via path b.In region I,the speed is 100 m/s while in region II,the speed is 71 m/s.How long does it take for the object to go from A to B?

Accepted Answer

A) 82.0 ms 
B) 70.8 ms 
C) 61.3 ms 
D) 34.3 ms 
E) 27.7 ms 
A) 82.0 ms 
B) 70.8 ms 
C) 61.3 ms 
D) 34.3 ms 
E) 27.7 ms

Question 6

Light is reflected from the surface of a lake (n = 1.33).What is the angle of incidence for which the reflected light is 100 percent polarized?

Accepted Answer

A) 53º 
B) 49º 
C) 45º 
D) 41º 
E) 37º 
A) 53º 
B) 49º 
C) 45º 
D) 41º 
E) 37º

Question 7

You shine light of frequency 4.00 $\times$ 1014 Hz through a glass plate whose index of refraction for this light is 1.50.The wavelength of this light in the glass is approximately

Accepted Answer

A) 500 nm 
B) 110 nm 
C) 800 nm 
D) 425 nm 
E) 380 nm 
A) 500 nm 
B) 110 nm 
C) 800 nm 
D) 425 nm 
E) 380 nm

Question 8

A light wave traveling in air impinges on an amber plate at an angle of incidence of 60º.If the angle of refraction is 34º,the velocity of light in amber must be approximately

Accepted Answer

A) 0.52 $\times$ 108 m/s 
B) 4.64 $\times$ 108 m/s 
C) 1.86 $\times$ 103 m/s 
D) 2.09 $\times$ 108 m/s 
E) 4.64 $\times$ 1010 m/s 
A) 0.52 $\times$ 108 m/s 
B) 4.64 $\times$ 108 m/s 
C) 1.86 $\times$ 103 m/s 
D) 2.09 $\times$ 108 m/s 
E) 4.64 $\times$ 1010 m/s

Question 9

In any wave motion,dependence of velocity on wavelength is called

Accepted Answer

A) polarization 
B) deviation 
C) dispersion 
D) diffraction 
E) scattering 
A) polarization 
B) deviation 
C) dispersion 
D) diffraction 
E) scattering

Question 10

Which of the following statements is true about the speeds of the various colors of light in glass?

Accepted Answer

A) All colors of light have the same speed in glass. 
B) violet has the highest speed,red the lowest 
C) red has the highest speed,violet the lowest 
D) green has the highest speed,red and violet the lowest 
E) red and violet have the highest speed,green the lowest 
A) All colors of light have the same speed in glass. 
B) violet has the highest speed,red the lowest 
C) red has the highest speed,violet the lowest 
D) green has the highest speed,red and violet the lowest 
E) red and violet have the highest speed,green the lowest

Question 11

Use the following figure for the next problem.  
-The film shows the line spectrum of an unknown element.If the wavelengths of lines (a),(b)and (c)are 410 nm,500 nm and 556 nm respectively,then the color of line (d)is

Accepted Answer

A) violet 
B) blue 
C) green 
D) yellow 
E) red 
A) violet 
B) blue 
C) green 
D) yellow 
E) red

Question 12

Light traveling in a transparent medium with an index of refraction n1 is incident on a transparent boundary with a second transparent medium with an index n2.Very little light is transmitted into the second medium.Which of the following statements must be true?

Accepted Answer

A) n1 equals n2 
B) n1 is somewhat greater than n2 
C) n2 is somewhat greater than n1 
D) n2 is much greater than n1 
E) Either index of refraction is much greater than the other 
A) n1 equals n2 
B) n1 is somewhat greater than n2 
C) n2 is somewhat greater than n1 
D) n2 is much greater than n1 
E) Either index of refraction is much greater than the other

Question 13

The wavelength light that has of a photon energy of 4.25 eV is

Accepted Answer

A) 292 nm 
B) 973 nm 
C) 706 nm 
D) 1559 nm 
E) None of these is correct. 
A) 292 nm 
B) 973 nm 
C) 706 nm 
D) 1559 nm 
E) None of these is correct.

Question 14

If light reflected from a transparent substance at an angle of 58.0º is completely plane polarized,light incident at an angle of 32.0º is refracted at an angle of

Accepted Answer

A) 32.0º 
B) 58.0º 
C) 19.3º 
D) 90.0º 
E) 70.7º 
A) 32.0º 
B) 58.0º 
C) 19.3º 
D) 90.0º 
E) 70.7º

Question 15

If the wavelength $\lambda$ of the incident light is large compared with the size of the atom,the probability of elastic scattering varies as

Accepted Answer

A) $\lambda$ 
B) $\lambda$4  
C) $\lambda$-4  
D) $\lambda$2  
E) $\lambda$-3  
A) $\lambda$ 
B) $\lambda$4  
C) $\lambda$-4  
D) $\lambda$2  
E) $\lambda$-3

Question 16

Two polarizers have their transmission axes at an angle $\theta$.Unpolarized light of intensity I is incident on the first polarizer.What is the intensity of the light transmitted by the second polarizer?

Accepted Answer

A) I cos2 $\theta$ 
B) 0.5I cos2 $\theta$ 
C) 0.25I cos2 $\theta$ 
D) I cos $\theta$ 
E) 0.25I cos $\theta$ 
A) I cos2 $\theta$ 
B) 0.5I cos2 $\theta$ 
C) 0.25I cos2 $\theta$ 
D) I cos $\theta$ 
E) 0.25I cos $\theta$

Question 17

A light wave in air strikes a glass plate 1 cm thick at an angle of incidence of 50.0º.If the index of refraction of the glass is 1.50 for this light,the actual path length of the light through the glass is approximately

Accepted Answer

A) 0.51 cm 
B) 1.16 cm 
C) 1.50 cm 
D) 2.11 cm 
E) 7.66 cm 
A) 0.51 cm 
B) 1.16 cm 
C) 1.50 cm 
D) 2.11 cm 
E) 7.66 cm

Question 18

A 60S1U1P1$\circ$S1S1P0 prism has a refractive index of 1.71.Calculate the angle of emergence out of the prism for a ray that enters one side at an angle almost parallel to one face,i.e.at 90S1U1P1$\circ$S1S1P0 to the normal.

Accepted Answer

A) 24.3S1U1P1$\circ$S1S1P0 
B) 35.8S1U1P1$\circ$S1S1P0 
C) 45.1S1U1P1$\circ$S1S1P0 
D) 48.7S1U1P1$\circ$S1S1P0 
E) 55.3S1U1P1$\circ$S1S1P0 
A) 24.3S1U1P1$\circ$S1S1P0 
B) 35.8S1U1P1$\circ$S1S1P0 
C) 45.1S1U1P1$\circ$S1S1P0 
D) 48.7S1U1P1$\circ$S1S1P0 
E) 55.3S1U1P1$\circ$S1S1P0

Question 19

When taking a picture of a highly reflecting surface,it is desirable to use a polarizer in front of the camera to cut down on the "glare".Suppose you are taking a picture of a lake where the water is very still.The polarizing axis of the polarizer should ideally be oriented

Accepted Answer

A) horizontally. 
B) vertically. 
C) at 30S1U1P1$\circ$S1S1P0. 
D) at 45S1U1P1$\circ$S1S1P0. 
E) in any direction. 
A) horizontally. 
B) vertically. 
C) at 30S1U1P1$\circ$S1S1P0. 
D) at 45S1U1P1$\circ$S1S1P0. 
E) in any direction.

Question 20

When light is reflected from a plane surface of glass at the polarizing angle,the

Accepted Answer

A) reflected ray is at right angles to the incident ray. 
B) angle of reflection is equal to the angle of refraction. 
C) incident ray is at right angles to the refracted ray. 
D) reflected ray is at right angles to the refracted ray. 
E) intensity of the reflected light is a maximum. 
A) reflected ray is at right angles to the incident ray. 
B) angle of reflection is equal to the angle of refraction. 
C) incident ray is at right angles to the refracted ray. 
D) reflected ray is at right angles to the refracted ray. 
E) intensity of the reflected light is a maximum.

Exam 31: Properties of Light

As light passes from one medium into another,the angle of refraction is _____ in the medium with the _____ index of refraction and _____ speed of light.

Ultra fast pulse lasers can emit pulses of the order 10 fs.If each pulse that is 10 fs long and the wavelength of the laser is 500 nm,the number of wavelengths in each pulse is

Light is incident at an angle of 60 ∘\circ∘ at an air to glass interface.If the angle of refraction inside the glass is 32 ∘\circ∘ ,then calculate the speed of light within the glass.

The minimum angle of deviation produced by a glass prism (n = 1.70 for the light used)whose apex angle is 45º is approximately

Use the following figure for the next problem. -An object leaves point A and travels in a straight line to point B via path b.In region I,the speed is 100 m/s while in region II,the speed is 71 m/s.How long does it take for the object to go from A to B?

Light is reflected from the surface of a lake (n = 1.33).What is the angle of incidence for which the reflected light is 100 percent polarized?

You shine light of frequency 4.00 ×\times× 1014 Hz through a glass plate whose index of refraction for this light is 1.50.The wavelength of this light in the glass is approximately

A light wave traveling in air impinges on an amber plate at an angle of incidence of 60º.If the angle of refraction is 34º,the velocity of light in amber must be approximately

In any wave motion,dependence of velocity on wavelength is called

Which of the following statements is true about the speeds of the various colors of light in glass?

Use the following figure for the next problem. -The film shows the line spectrum of an unknown element.If the wavelengths of lines (a),(b)and (c)are 410 nm,500 nm and 556 nm respectively,then the color of line (d)is

Light traveling in a transparent medium with an index of refraction n1 is incident on a transparent boundary with a second transparent medium with an index n2.Very little light is transmitted into the second medium.Which of the following statements must be true?

The wavelength light that has of a photon energy of 4.25 eV is

If light reflected from a transparent substance at an angle of 58.0º is completely plane polarized,light incident at an angle of 32.0º is refracted at an angle of

If the wavelength λ\lambdaλ of the incident light is large compared with the size of the atom,the probability of elastic scattering varies as

Two polarizers have their transmission axes at an angle θ\thetaθ .Unpolarized light of intensity I is incident on the first polarizer.What is the intensity of the light transmitted by the second polarizer?

A light wave in air strikes a glass plate 1 cm thick at an angle of incidence of 50.0º.If the index of refraction of the glass is 1.50 for this light,the actual path length of the light through the glass is approximately

A 60 ∘\circ∘ prism has a refractive index of 1.71.Calculate the angle of emergence out of the prism for a ray that enters one side at an angle almost parallel to one face,i.e.at 90 ∘\circ∘ to the normal.

When taking a picture of a highly reflecting surface,it is desirable to use a polarizer in front of the camera to cut down on the "glare".Suppose you are taking a picture of a lake where the water is very still.The polarizing axis of the polarizer should ideally be oriented

When light is reflected from a plane surface of glass at the polarizing angle,the

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Filters

As light passes from one medium into another,the angle of refraction is ___ in the medium with the _ index of refraction and ___ speed of light.

Light is incident at an angle of 60^$\circ$ at an air to glass interface.If the angle of refraction inside the glass is 32^$\circ$,then calculate the speed of light within the glass.

You shine light of frequency 4.00 $\times$ 10¹⁴Hz through a glass plate whose index of refraction for this light is 1.50.The wavelength of this light in the glass is approximately

Light traveling in a transparent medium with an index of refraction n₁ is incident on a transparent boundary with a second transparent medium with an index n₂.Very little light is transmitted into the second medium.Which of the following statements must be true?

If the wavelength $\lambda$ of the incident light is large compared with the size of the atom,the probability of elastic scattering varies as

Two polarizers have their transmission axes at an angle $\theta$ .Unpolarized light of intensity I is incident on the first polarizer.What is the intensity of the light transmitted by the second polarizer?

A 60^$\circ$ prism has a refractive index of 1.71.Calculate the angle of emergence out of the prism for a ray that enters one side at an angle almost parallel to one face,i.e.at 90^$\circ$ to the normal.