Question 1

In a Young's double-slit experiment the center of a bright fringe occurs wherever waves from the slits differ in the distance they travel by a multiple of:

Accepted Answer

A)  a fourth of a wavelength 
B)  a half a wavelength 
C)  three-fourths of a wavelength 
D)  a wavelength 
E)  none of the above 
A)  a fourth of a wavelength 
B)  a half a wavelength 
C)  three-fourths of a wavelength 
D)  a wavelength 
E)  none of the above

Question 2

Huygens' construction can be used only:

Accepted Answer

A)  for light 
B)  for an electromagnetic wave 
C)  if one of the media is vacuum (or air) 
D)  for transverse waves 
E)  for all of these and other situations 
A)  for light 
B)  for an electromagnetic wave 
C)  if one of the media is vacuum (or air) 
D)  for transverse waves 
E)  for all of these and other situations

Question 3

If the speed of light is c, and the index of refraction of a material is n, what is the speed of light in the material?

Accepted Answer

A)  c 
B)  c/n 
C)  nc 
D)  n 
E)  n/c 
A)  c 
B)  c/n 
C)  nc 
D)  n 
E)  n/c

Question 4

The phase difference between the two waves which give rise to a dark spot in a Young's double-slit experiment is (where m = integer):

Accepted Answer

A)  2 $\pi$m 
B)  2 $\pi$m +  $\pi$/8 
C)  2 $\pi$m +  $\pi$/4 
D)  2 $\pi$m +  $\pi$/2 
E)  2 $\pi$m +  $\pi$ 
A)  2 $\pi$m 
B)  2 $\pi$m +  $\pi$/8 
C)  2 $\pi$m +  $\pi$/4 
D)  2 $\pi$m +  $\pi$/2 
E)  2 $\pi$m +  $\pi$

Question 5

In a Michelson interferometer, in order to shift the pattern by half a fringe, one of the mirrors at the end of an arm must be moved by:

Accepted Answer

A)  one wavelength 
B)  half a wavelength 
C)  one-quarter wavelength 
D)  It depends on the wavelength. 
E)  It depends on which mirror is moved. 
A)  one wavelength 
B)  half a wavelength 
C)  one-quarter wavelength 
D)  It depends on the wavelength. 
E)  It depends on which mirror is moved.

Question 6

Monochromatic light, at normal incidence, strikes a thin film in air. If $\lambda$denotes the wavelength in the film, what is the thinnest film in which the reflected light will be a maximum?

Accepted Answer

A)  much less than $\lambda$ 
B)  $\lambda$/4 
C)  $\lambda$/2 
D)  3$\lambda$/4 
E)  $\lambda$ 
A)  much less than $\lambda$ 
B)  $\lambda$/4 
C)  $\lambda$/2 
D)  3$\lambda$/4 
E)  $\lambda$

Exam 35: Interference

In a Young's double-slit experiment the center of a bright fringe occurs wherever waves from the slits differ in the distance they travel by a multiple of:

Huygens' construction can be used only:

If the speed of light is c, and the index of refraction of a material is n, what is the speed of light in the material?

The phase difference between the two waves which give rise to a dark spot in a Young's double-slit experiment is (where m = integer):

In a Michelson interferometer, in order to shift the pattern by half a fringe, one of the mirrors at the end of an arm must be moved by:

Monochromatic light, at normal incidence, strikes a thin film in air. If λ\lambdaλ denotes the wavelength in the film, what is the thinnest film in which the reflected light will be a maximum?

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Filters

Monochromatic light, at normal incidence, strikes a thin film in air. If $\lambda$ denotes the wavelength in the film, what is the thinnest film in which the reflected light will be a maximum?