Question 1

Monochromatic light hits a piece of glass.What happens to the wavelength in the glass as the index of refraction increases?

Accepted Answer

A) decreases 
B) increases 
C) remains constant 
D) approaches 3 × 108 m 
A) decreases 
B) increases 
C) remains constant 
D) approaches 3 × 108 m

Question 2

According to the photon energy formula,quadrupling the frequency of the radiation from a monochromatic source will change the energy content of the individually radiated photons by what factor?

Accepted Answer

A) 1/4 
B) 1 
C)    
D) 4 
E) 42 
A) 1/4 
B) 1 
C)    
D) 4 
E) 42

Question 3

Assuming the frequency remains constant,a monochromatic light ray is transmitted through an glass-to-air boundary,what happens to the wavelength?

Accepted Answer

A) decreases 
B) approaches zero value 
C) increases 
D) remains unchanged 
A) decreases 
B) approaches zero value 
C) increases 
D) remains unchanged

Question 4

Photon A has an energy of 3.3 × 10-19 J.Photon B has 4 times the frequency of Photon A.What is the energy of Photon B?

Accepted Answer

A) 8.3E-20 J 
B) 1.7E-19 J 
C) 1.3E-18 J 
D) 6.6E-19 J 
E) ​5.3E-18 J 
A) 8.3E-20 J 
B) 1.7E-19 J 
C) 1.3E-18 J 
D) 6.6E-19 J 
E) ​5.3E-18 J

Question 5

A ray of light strikes a thick sheet of glass (n = 1.5)at an angle of 20° with the normal.Find the angle of the refracted ray within the glass with respect to the normal.

Accepted Answer

A) 31° 
B) 0.23° 
C) 37° 
D) 13° 
E) 20° 
A) 31° 
B) 0.23° 
C) 37° 
D) 13° 
E) 20°

Question 6

A ray of light passes from one material into a material with a higher index of refraction.Which quantity remains unchanged?​

Accepted Answer

A) ​The light's speed 
B) ​The light's wavelength 
C) ​The light ray's angle with the normal 
D) ​The photon energy 
A) ​The light's speed 
B) ​The light's wavelength 
C) ​The light ray's angle with the normal 
D) ​The photon energy

Question 7

Helium-neon laser light has a wavelength in air of 632.8 nm.What is the energy of a single photon in the beam? (h = 6.626 × 10−34 J⋅s and c = 3.00 × 108 m/s).

Accepted Answer

A) 3.14 × 10−19 J 
B) 5.40 × 10−19 J 
C) 7.62 × 10−19 J 
D) 1.15 × 10−18 J 
A) 3.14 × 10−19 J 
B) 5.40 × 10−19 J 
C) 7.62 × 10−19 J 
D) 1.15 × 10−18 J

Question 8

A beam of monochromatic light goes from material 1 with index of refraction n1 into material 2 with index of refraction n2.The frequency of light in material 1 is f1 and in material 2 is f2.What is the ratio of f1/f2?

Accepted Answer

A) n1/n2 
B) n2/n1 
C) 1 
D) The values of n1 and n2 must be known to find the answer. 
A) n1/n2 
B) n2/n1 
C) 1 
D) The values of n1 and n2 must be known to find the answer.

Question 9

Who formulated the theory explaining the photoelectric effect?

Accepted Answer

A) Hertz 
B) Maxwell 
C) Newton 
D) Einstein 
A) Hertz 
B) Maxwell 
C) Newton 
D) Einstein

Question 10

Three materials with n1 2 3 are arranged in layers of uniform thickness.A light ray in air enters the first layer at an angle of incidence of 30° and the ray eventually exits the third layer at the refracted angle θ in air.What is the value of θ?

Accepted Answer

A) Some angle less than 30°. 
B) 30°. 
C) Some angle more than 30°. 
D) Insufficient information to answer. 
A) Some angle less than 30°. 
B) 30°. 
C) Some angle more than 30°. 
D) Insufficient information to answer.

Question 11

The lowest possible value for the index of refraction is:

Accepted Answer

A) 0. 
B) 1. 
C)    /2. 
D) 1/   . 
A) 0. 
B) 1. 
C)    /2. 
D) 1/   .

Question 12

What is the angle of incidence on an air-to-glass boundary if the angle of refraction in the glass (n = 1.52)is 28.0°?

Accepted Answer

A) 18.0° 
B) 28.0° 
C) 42.6° 
D) 45.5° 
E) 18.4° 
A) 18.0° 
B) 28.0° 
C) 42.6° 
D) 45.5° 
E) 18.4°

Question 13

As the angle of incidence is increased for a ray incident on a reflecting surface,the angle between the incident and reflected rays ultimately approaches what value?

Accepted Answer

A) zero 
B) 45° 
C) 90° 
D) 180° 
A) zero 
B) 45° 
C) 90° 
D) 180°

Question 14

Before light can undergo total internal reflection when incident on material 2 from material 1,what must be true of the indices of refraction?

Accepted Answer

A) n1 = n2 
B) n1 2 
C) n1 > n2 
D) Either n1 or n2 must be equal to 1. 
A) n1 = n2 
B) n1 2 
C) n1 > n2 
D) Either n1 or n2 must be equal to 1.

Question 15

One phenomenon that demonstrates the particle nature of light is:

Accepted Answer

A) the photoelectric effect. 
B) diffraction effects. 
C) interference effects. 
D) the prediction by Maxwell's electromagnetic theory. 
A) the photoelectric effect. 
B) diffraction effects. 
C) interference effects. 
D) the prediction by Maxwell's electromagnetic theory.

Question 16

A light beam is incident upon a still water surface.What is the maximum possible value for the angle of refraction? (nwater = 1.333).

Accepted Answer

A) 76.2° 
B) 67.5° 
C) 54.4° 
D) 48.6° 
A) 76.2° 
B) 67.5° 
C) 54.4° 
D) 48.6°

Question 17

In glass,which of the following colors of light travels fastest?

Accepted Answer

A) red 
B) blue 
C) yellow 
D) All three of the above travel at the same speed. 
A) red 
B) blue 
C) yellow 
D) All three of the above travel at the same speed.

Question 18

What is the cause of refraction of a wave traveling from one medium to another?

Accepted Answer

A) There is a frequency change due to the change in the medium 
B) There is a speed change due to the change in the medium. 
C) There is a change in wave amplitude due to the change in the medium. 
D) None of the above are associated with refraction. 
A) There is a frequency change due to the change in the medium 
B) There is a speed change due to the change in the medium. 
C) There is a change in wave amplitude due to the change in the medium. 
D) None of the above are associated with refraction.

Question 19

An optical fiber is made of clear plastic with index of refraction n = 1.57.For what angles with the surface will light remain within the plastic "guide"?

Accepted Answer

A) ϕ < 32.5° 
B) ϕ < 57.3° 
C) ϕ < 39.6° 
D) ϕ < 50.4° 
E) ϕ < 68.7° 
A) ϕ < 32.5° 
B) ϕ < 57.3° 
C) ϕ < 39.6° 
D) ϕ < 50.4° 
E) ϕ < 68.7°

Question 20

Light from a 604-nm monochromatic source is incident upon the surface of fused quartz (n = 1.56)at an angle of 48°.What is the angle of reflection from the surface?

Accepted Answer

A) 12° 
B) 24° 
C) 48° 
D) 31° 
E) 75° 
A) 12° 
B) 24° 
C) 48° 
D) 31° 
E) 75°

Exam 22: Reflection and Refraction of Light

Monochromatic light hits a piece of glass.What happens to the wavelength in the glass as the index of refraction increases?

According to the photon energy formula,quadrupling the frequency of the radiation from a monochromatic source will change the energy content of the individually radiated photons by what factor?

Assuming the frequency remains constant,a monochromatic light ray is transmitted through an glass-to-air boundary,what happens to the wavelength?

Photon A has an energy of 3.3 × 10-19 J.Photon B has 4 times the frequency of Photon A.What is the energy of Photon B?

A ray of light strikes a thick sheet of glass (n = 1.5)at an angle of 20° with the normal.Find the angle of the refracted ray within the glass with respect to the normal.

A ray of light passes from one material into a material with a higher index of refraction.Which quantity remains unchanged?​

Helium-neon laser light has a wavelength in air of 632.8 nm.What is the energy of a single photon in the beam? (h = 6.626 × 10−34 J⋅s and c = 3.00 × 108 m/s).

A beam of monochromatic light goes from material 1 with index of refraction n1 into material 2 with index of refraction n2.The frequency of light in material 1 is f1 and in material 2 is f2.What is the ratio of f1/f2?

Who formulated the theory explaining the photoelectric effect?

Three materials with n1 < n2 < n3 are arranged in layers of uniform thickness.A light ray in air enters the first layer at an angle of incidence of 30° and the ray eventually exits the third layer at the refracted angle θ in air.What is the value of θ?

The lowest possible value for the index of refraction is:

What is the angle of incidence on an air-to-glass boundary if the angle of refraction in the glass (n = 1.52)is 28.0°?

As the angle of incidence is increased for a ray incident on a reflecting surface,the angle between the incident and reflected rays ultimately approaches what value?

Before light can undergo total internal reflection when incident on material 2 from material 1,what must be true of the indices of refraction?

One phenomenon that demonstrates the particle nature of light is:

A light beam is incident upon a still water surface.What is the maximum possible value for the angle of refraction? (nwater = 1.333).

In glass,which of the following colors of light travels fastest?

What is the cause of refraction of a wave traveling from one medium to another?

An optical fiber is made of clear plastic with index of refraction n = 1.57.For what angles with the surface will light remain within the plastic "guide"?

Light from a 604-nm monochromatic source is incident upon the surface of fused quartz (n = 1.56)at an angle of 48°.What is the angle of reflection from the surface?

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Photon A has an energy of 3.3 × 10^-19 J.Photon B has 4 times the frequency of Photon A.What is the energy of Photon B?

A ray of light passes from one material into a material with a higher index of refraction.Which quantity remains unchanged?

Helium-neon laser light has a wavelength in air of 632.8 nm.What is the energy of a single photon in the beam? (h = 6.626 × 10−³⁴ J⋅s and c = 3.00 × 10⁸ m/s).

A beam of monochromatic light goes from material 1 with index of refraction n₁ into material 2 with index of refraction n₂.The frequency of light in material 1 is f₁ and in material 2 is f₂.What is the ratio of f₁/f₂?

Three materials with n₁ < n₂ < n₃ are arranged in layers of uniform thickness.A light ray in air enters the first layer at an angle of incidence of 30° and the ray eventually exits the third layer at the refracted angle θ in air.What is the value of θ?

A light beam is incident upon a still water surface.What is the maximum possible value for the angle of refraction? (n_water = 1.333).