Question 1

When a ray of light traveling in air is incident at θ = 50º on a plane-parallel slab of glass as illustrated, the light ray

Accepted Answer

A)  is 100 percent reflected at the first surface. 
B)  is 100 percent reflected at the second surface. 
C)  emerges parallel to the incident ray and is not displaced to one side or the other of the incident ray. 
D)  is absorbed if the wavelength is greater than 450 nm. 
E)  is not described by any of these statements. 
A)  is 100 percent reflected at the first surface. 
B)  is 100 percent reflected at the second surface. 
C)  emerges parallel to the incident ray and is not displaced to one side or the other of the incident ray. 
D)  is absorbed if the wavelength is greater than 450 nm. 
E)  is not described by any of these statements.

Question 2

Of the following quantities, the one that is independent of the frequency of light is the

Accepted Answer

A)  polarizing angle. 
B)  critical angle. 
C)  angle of minimum deviation. 
D)  angle of refraction. 
E)  angle of reflection. 
A)  polarizing angle. 
B)  critical angle. 
C)  angle of minimum deviation. 
D)  angle of refraction. 
E)  angle of reflection.

Question 3

Light from an underwater source at O impinges upon a water-air interface. The critical angle is

Accepted Answer

A)  1. 
B)  2. 
C)  3. 
D)  4. 
E)  5. 
A)  1. 
B)  2. 
C)  3. 
D)  4. 
E)  5.

Question 4

The index of refraction is related to the prism angle and the angle of minimum deviation by n = sin ½d + f)/sin ½f
The angle of minimum deviation in the figure is angle

Accepted Answer

A)  1. 
B)  2. 
C)  3. 
D)  4. 
E)  5. 
A)  1. 
B)  2. 
C)  3. 
D)  4. 
E)  5.

Question 5

White light is incident on a prism from the left. After it passes through the first prism, a color spectrum of light is observed. The spectrum is then passed through a second prism, which is inverted compared to the first prism. The color light that exits from the second prism

Accepted Answer

A)  is also a color spectrum and more spread out. 
B)  is also a color spectrum but less spread out. 
C)  is white in color. 
D)  has more colors than the first spectrum. 
E)  has fewer colors than the first spectrum. 
A)  is also a color spectrum and more spread out. 
B)  is also a color spectrum but less spread out. 
C)  is white in color. 
D)  has more colors than the first spectrum. 
E)  has fewer colors than the first spectrum.

Question 6

A fiber optic is made by cladding a thin fiber core of refractive index n1 = 1.45 with a material of refractive index n2 = 1.38. What is the maximum incident angle, Ɵ, so that the light ray is totally internally reflected inside the fiber?

Accepted Answer

A)  24.1º 
B)  26.4º 
C)  28.2º 
D)  30.3º 
E)  32.7º 
A)  24.1º 
B)  26.4º 
C)  28.2º 
D)  30.3º 
E)  32.7º

Question 7

In a double-slit experiment, the distance from the slits to the screen is decreased by a factor of 2. If the distance between the fringes is small compared with the distance from the slits to the screen, the distance between adjacent fringes

Accepted Answer

A)  increases by a factor of 2. 
B)  increases by a factor of 4. 
C)  depends on the width of the slits. 
D)  decreases by a factor of 2. 
E)  decreases by a factor of 4. 
A)  increases by a factor of 2. 
B)  increases by a factor of 4. 
C)  depends on the width of the slits. 
D)  decreases by a factor of 2. 
E)  decreases by a factor of 4.

Question 8

A fiber optic is made by cladding a thin fiber core of refractive index n1 = 1.45 with a material of refractive index n2 = 1.38. The numerical aperture of a fiber optic is defined as NA = nair sin θm, where θm is the maximum incident angle so that the light ray is totally internally reflected inside the fiber. The NA for the fiber is

Accepted Answer

A)  0.445. 
B)  0.614. 
C)  0.645. 
D)  0.407. 
E)  0.470. 
A)  0.445. 
B)  0.614. 
C)  0.645. 
D)  0.407. 
E)  0.470.

Question 9

Two flat planes of glass are laid on top of one another. The upper plane is slightly raised due to the insertion of a thin piece of paper at one end and an air wedge is thus formed. Light of wavelength 500 nm is normally incident on the glass from above and interference fringes are observed by reflection with 2.5 fringes per cm. Calculate the angle of the wedge.

Accepted Answer

A)  6.3 × 10-5 deg 
B)  1.8 × 10-3 deg 
C)  4.0 × 10-4 deg 
D)  3.6 × 10-3 deg 
E)  5.7 × 10-4 deg 
A)  6.3 × 10-5 deg 
B)  1.8 × 10-3 deg 
C)  4.0 × 10-4 deg 
D)  3.6 × 10-3 deg 
E)  5.7 × 10-4 deg

Question 10

Light of wave length l is incident on two thin films that are in contact and surrounded by air. The top layer is λ/4 thick and has an index of refraction of 1.33. The bottom layer is λ/2 thick and has an index of refraction of 1.50. At normal incidence, the reflected rays that are in phase with each other are

Accepted Answer

A)  1 and 2. 
B)  1 and 3. 
C)  2 and 3. 
D)  1, 2, and 3. 
E)  None of these is correct. 
A)  1 and 2. 
B)  1 and 3. 
C)  2 and 3. 
D)  1, 2, and 3. 
E)  None of these is correct.

Question 11

For the prism immersed in water n = 1.33), the minimum index of refraction that will produce total reflection of the indicated ray is approximately

Accepted Answer

A)  0.94. 
B)  1.28. 
C)  1.50. 
D)  1.65. 
E)  1.88. 
A)  0.94. 
B)  1.28. 
C)  1.50. 
D)  1.65. 
E)  1.88.

Question 12

You are trying to catch fish by using a spear. You observe a large fish a couple of meters in front of you and a meter below the water surface. In order to hit the fish with your spear you must aim assume that the fish is stationary and does not swim away in fright)

Accepted Answer

A)  directly at the point where you see the fish. 
B)  slightly above the point where you see the fish. 
C)  slightly below the point where you see the fish. 
D)  slightly to the left side of the point where you see the fish. 
E)  slightly to the right side of the point where you see the fish. 
A)  directly at the point where you see the fish. 
B)  slightly above the point where you see the fish. 
C)  slightly below the point where you see the fish. 
D)  slightly to the left side of the point where you see the fish. 
E)  slightly to the right side of the point where you see the fish.

Question 13

The path difference for the two waves shown in the figure could be

Accepted Answer

A)  ¾ λ. 
B)  ½ λ. 
C)  ¼ λ. 
D)  λ. 
E)  It is not possible to answer this question without additional information. 
A)  ¾ λ. 
B)  ½ λ. 
C)  ¼ λ. 
D)  λ. 
E)  It is not possible to answer this question without additional information.

Question 14

Which of the following is not a phenomenon by which polarized light can be produced from unpolarized light?

Accepted Answer

A)  absorption 
B)  reflection 
C)  birefringence 
D)  diffraction 
E)  scattering 
A)  absorption 
B)  reflection 
C)  birefringence 
D)  diffraction 
E)  scattering

Question 15

Light is incident on a piece of glass in air at an angle of 37.0º from the normal. If the index of refraction of the glass is 1.50, the angle that the refracted ray makes with the normal is approximately

Accepted Answer

A)  8.6º. 
B)  21.8º. 
C)  23.6º. 
D)  41.8º. 
E)  56.4º. 
A)  8.6º. 
B)  21.8º. 
C)  23.6º. 
D)  41.8º. 
E)  56.4º.

Question 16

Light that has been traveling in a medium with an index of refraction n2 is incident on the boundary surface of another medium with an index of refraction n1. Given a sufficient angle of incidence, which of the following conditions must be satisfied for total internal reflection to occur?

Accepted Answer

A)  n1 2  
B)  n1 > n2  
C)  n1 = n2  
D)  Any of these may be correct. 
E)  None of these is correct. 
A)  n1 2  
B)  n1 > n2  
C)  n1 = n2  
D)  Any of these may be correct. 
E)  None of these is correct.

Question 17

If a thin soap film n = 1.36) reflects predominately red light about 680 nm), then what is the minimum thickness of the soap film?

Accepted Answer

A)  1.25 × 10-7 m 
B)  6.80 × 10-7 m 
C)  2.50 × 10-7 m 
D)  5.00 × 10-7 m 
E)  None of these is correct. 
A)  1.25 × 10-7 m 
B)  6.80 × 10-7 m 
C)  2.50 × 10-7 m 
D)  5.00 × 10-7 m 
E)  None of these is correct.

Question 18

In a double-refracting birefringent) crystal, the e ray is polarized with respect to the o ray at an angle of

Accepted Answer

A)  90º. 
B)  17º. 
C)  73º. 
D)  0º. 
E)  None of these is correct because the e ray is unpolarized. 
A)  90º. 
B)  17º. 
C)  73º. 
D)  0º. 
E)  None of these is correct because the e ray is unpolarized.

Question 19

A 3.5-cm-long microscope glass slide has one edge in contact with a flat plane of glass, while the other edge is slightly raised due to the insertion of a thin piece of paper. Sodium light of wavelength 589 nm is normally incident on the glass from above and interference fringes are observed by reflection with a regular spacing of 0.22 mm. Calculate the thickness of the piece of paper.

Accepted Answer

A)  9.4 × 10-5 m 
B)  5.5 × 10-5 m 
C)  2.4 × 10-5 m 
D)  4.7 × 10-5 m 
E)  None of these is correct. 
A)  9.4 × 10-5 m 
B)  5.5 × 10-5 m 
C)  2.4 × 10-5 m 
D)  4.7 × 10-5 m 
E)  None of these is correct.

Question 20

Two slits of width a = 0.0016 mm are separated by a distance d = 0.04 mm and illuminated by light of wavelength λ = 450 nm. The number of bright fringes seen in the central maximum is

Accepted Answer

A)  8. 
B)  16. 
C)  25. 
D)  37. 
E)  49. 
A)  8. 
B)  16. 
C)  25. 
D)  37. 
E)  49.

Exam 23: Wave Properties of Light

When a ray of light traveling in air is incident at θ = 50º on a plane-parallel slab of glass as illustrated, the light ray

Of the following quantities, the one that is independent of the frequency of light is the

Light from an underwater source at O impinges upon a water-air interface. The critical angle is

The index of refraction is related to the prism angle and the angle of minimum deviation by n = sin ½d + f)/sin ½f The angle of minimum deviation in the figure is angle

White light is incident on a prism from the left. After it passes through the first prism, a color spectrum of light is observed. The spectrum is then passed through a second prism, which is inverted compared to the first prism. The color light that exits from the second prism

A fiber optic is made by cladding a thin fiber core of refractive index n1 = 1.45 with a material of refractive index n2 = 1.38. What is the maximum incident angle, Ɵ, so that the light ray is totally internally reflected inside the fiber?

In a double-slit experiment, the distance from the slits to the screen is decreased by a factor of 2. If the distance between the fringes is small compared with the distance from the slits to the screen, the distance between adjacent fringes

For the prism immersed in water n = 1.33), the minimum index of refraction that will produce total reflection of the indicated ray is approximately

You are trying to catch fish by using a spear. You observe a large fish a couple of meters in front of you and a meter below the water surface. In order to hit the fish with your spear you must aim assume that the fish is stationary and does not swim away in fright)

The path difference for the two waves shown in the figure could be

Which of the following is not a phenomenon by which polarized light can be produced from unpolarized light?

Light is incident on a piece of glass in air at an angle of 37.0º from the normal. If the index of refraction of the glass is 1.50, the angle that the refracted ray makes with the normal is approximately

Light that has been traveling in a medium with an index of refraction n2 is incident on the boundary surface of another medium with an index of refraction n1. Given a sufficient angle of incidence, which of the following conditions must be satisfied for total internal reflection to occur?

If a thin soap film n = 1.36) reflects predominately red light about 680 nm), then what is the minimum thickness of the soap film?

In a double-refracting birefringent) crystal, the e ray is polarized with respect to the o ray at an angle of

Two slits of width a = 0.0016 mm are separated by a distance d = 0.04 mm and illuminated by light of wavelength λ = 450 nm. The number of bright fringes seen in the central maximum is

Introduction to Physics

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$For the prism immersed in water n = 1.33), the minimum index of refraction that will produce total reflection of the indicated ray is approximately$ For the prism immersed in water n = 1.33), the minimum index of refraction that will produce total reflection of the indicated ray is approximately

Light that has been traveling in a medium with an index of refraction n₂ is incident on the boundary surface of another medium with an index of refraction n₁. Given a sufficient angle of incidence, which of the following conditions must be satisfied for total internal reflection to occur?

$In a double-refracting birefringent) crystal, the e ray is polarized with respect to the o ray at an angle of$ In a double-refracting birefringent) crystal, the e ray is polarized with respect to the o ray at an angle of