Question 1

When light travels from one medium into a different medium with a different index of refraction,

Accepted Answer

A) the frequency, wavelength, and speed all change. 
B) the frequency and wavelength change but the speed stays the same. 
C) the speed and wavelength change but the frequency stays the same. 
D) the speed and frequency change but the wavelength stays the same. 
E) only the speed changes; the frequency and the wavelength stay the same. 
A) the frequency, wavelength, and speed all change. 
B) the frequency and wavelength change but the speed stays the same. 
C) the speed and wavelength change but the frequency stays the same. 
D) the speed and frequency change but the wavelength stays the same. 
E) only the speed changes; the frequency and the wavelength stay the same.

Question 2

Binoculars and microscopes are frequently made with coated optics by adding a thin layer of transparent material to the lens surface as shown, in order to improve light transmission.One wants:

Accepted Answer

A) constructive interference between waves 1 and 2 
B) destructive interference between waves 3 and 4 
C) constructive interference between waves 3 and 4 
D) the coating to be more transparent than the lens 
E) the speed of light in the coating to be less than that in the lens 
A) constructive interference between waves 1 and 2 
B) destructive interference between waves 3 and 4 
C) constructive interference between waves 3 and 4 
D) the coating to be more transparent than the lens 
E) the speed of light in the coating to be less than that in the lens

Question 3

A "wave front" is a surface of constant:

Accepted Answer

A) phase 
B) frequency 
C) wavelength 
D) amplitude 
E) speed 
A) phase 
B) frequency 
C) wavelength 
D) amplitude 
E) speed

Question 4

A glass (n = 1.6)lens is coated with a thin film (n = 1.3)to reduce reflection of certain incident light.If $\lambda$ is the wavelength of the light in the film, the least film thickness is:

Accepted Answer

A) "less than $\lambda$/4" 
B) "$\lambda$/4" 
C) "$\lambda$/2" 
D) "$\lambda$" 
E) "more than $\lambda$" 
A) "less than $\lambda$/4" 
B) "$\lambda$/4" 
C) "$\lambda$/2" 
D) "$\lambda$" 
E) "more than $\lambda$"

Question 5

If the wavelength of a particular beam of light in vacuum is λ, and the index of refraction of a material is n, what is the wavelength of the light in the material?

Accepted Answer

A) λ 
B) λ/n 
C) nλ 
D) n 
E) n/λ 
A) λ 
B) λ/n 
C) nλ 
D) n 
E) n/λ

Exam 35: Interference

When light travels from one medium into a different medium with a different index of refraction,

Binoculars and microscopes are frequently made with coated optics by adding a thin layer of transparent material to the lens surface as shown, in order to improve light transmission.One wants:

A "wave front" is a surface of constant:

A glass (n = 1.6)lens is coated with a thin film (n = 1.3)to reduce reflection of certain incident light.If λ\lambdaλ is the wavelength of the light in the film, the least film thickness is:

If the wavelength of a particular beam of light in vacuum is λ, and the index of refraction of a material is n, what is the wavelength of the light in the material?

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A glass (n = 1.6)lens is coated with a thin film (n = 1.3)to reduce reflection of certain incident light.If $\lambda$ is the wavelength of the light in the film, the least film thickness is: