Question 1

When a beam of light, which is traveling in glass, strikes an air boundary, there is

Accepted Answer

A)  a 90° phase change in the reflected beam. 
B)  no phase change in the reflected beam. 
C)  a 180° phase change in the reflected beam. 
D)  a 60° phase change in the reflected beam. 
E)  a 45° phase change in the reflected beam.

Question 2

A film of thickness 106 nm soap bubble film (n = 1.42) results in a constructive interference in the reflected light if this film is illuminated by a beam of light with a wavelength of 601 nm. What are the next three thicknesses of this film that will also result in a constructive interference?

Accepted Answer

A)  212 nm, 318 nm, 424 nm 
B)  53.0 nm, 35.3 nm, 26.5 nm 
C)  212 nm, 424 nm, 636 nm 
D)  67.0 nm, 42.4 nm, 22.3 nm 
E)  317 nm, 529 nm, 741 nm

Question 3

Light of wavelength 500 nm illuminates a soap film ( n = 1.33). What is the minimum thickness of film that will give an interference when the light is incident normally on it?

Accepted Answer

A)  24 nm 
B)  56 nm 
C)  94 nm 
D)  188 nm 
E)  376 nm

Question 4

The limiting angle of resolution for the eye is 1.4 × 10-4 rad. What is the minimum separation between two point sources of light that the eye can distinguish if they are at a distance of 40 m from the observer?

Accepted Answer

A)  2.8 × 10-3 m 
B)  5.6 × 10-3 m 
C)  1.4 × 10-3 m 
D)  8.4 × 10-3 m 
E)  4.7 × 10-3 m

Question 5

Consider a diffraction grating with 7000. lines/cm with a screen 2.50 m away and 440. nm wavelength light.
(a) How many side maxima would be observed on one side of the central maximum?
(b) What is the linear distance between the 1st and 2nd maxima?

Accepted Answer

The answer of Consider a diffraction grating with 7000. lines/cm...

Question 6

The wavelength of light is important for thin film interference to occur within the film itself.

Accepted Answer

A) True 
 B)False

Question 7

A soap bubble has an index of refraction of 1.33. What minimum thickness of this bubble will ensure maximum reflectance of normally incident 530. nm wavelength light?

Accepted Answer

The answer of A soap bubble has an index of...

Question 8

What is the limiting angle of resolution for the eye if the pupil diameter of the eye is 4.0 mm, a wavelength of light of 600 nm and index of refraction for the eye equal to 1.34?

Accepted Answer

A)  4.2 × 10-4 rad 
B)  2.1 × 10-4 rad 
C)  1.4 × 10-4 rad 
D)  1.1 × 10-4 rad 
E)  2.6 × 10-4 rad

Question 9

What is the slit spacing of a diffraction necessary for a 600 nm light to have a first order principal maximum at 25.0°?

Accepted Answer

A)  1.42 μm 
B)  2.01 μm 
C)  3.12 μm 
D)  4.12 μm 
E)  5.44 μm

Question 10

If the distance between the slits and the screen is increased in Young's two-slit experiment, which one of the following statements is true of the interference pattern?

Accepted Answer

A)  The distance between the minima stays the same. 
B)  The distance between the minima decreases. 
C)  The distance between the maxima stays the same 
D)  The distance between the maxima increases. 
E)  Impossible to tell without knowing the wavelength of light in use.

Question 11

If the wavelength of light in Young's two-slit experiment is decreased, which one of the following statements is true of the interference pattern?

Accepted Answer

A)  The distance between the minima stays the same. 
B)  The distance between the maxima decreases. 
C)  The distance between maxima stays the same. 
D)  The distance between the maxima increases. 
E)  Impossible to tell without knowing the separation between the slits.

Question 12

A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength is doubled?

Accepted Answer

A)  It will be cut to one-quarter its original size. 
B)  It will be cut in half. 
C)  It will double. 
D)  It will become four times as large. 
E)  It will become eight times as large.

Question 13

A monochromatic beam of light of wavelength 600 nm is incident normally on a diffraction grating with a slit spacing of 1.70 × 10-4 cm. What is the angle for the first order maximum?

Accepted Answer

A)  10.5° 
B)  12.1° 
C)  16.4° 
D)  18.2° 
E)  20.7°

Question 14

In a double-slit experiment, the slit separation is 2.0 mm, and two wavelengths, 750. nm and 900. nm, illuminate the slits. A screen is placed 2.0 m from the slits. At what distance from the central maximum on the screen will a bright fringe from one pattern first coincide with a bright fringe from the other?

Accepted Answer

The answer of In a double-slit experiment, the slit separation...

Question 15

Interference is the superposition of two or more waves.

Accepted Answer

A) True 
 B)False

Question 16

A soap bubble has an index of refraction of 1.33. What minimum thickness of this bubble will ensure maximum reflectance of normally incident 530 nm wavelength light?

Accepted Answer

A)  24.9 nm 
B)  76.9 nm 
C)  99.6 nm 
D)  199 nm 
E)  398 nm

Question 17

When a beam of light, which is traveling in air, is reflected by a glass surface, there is

Accepted Answer

A)  a 90° phase change in the reflected beam. 
B)  no phase change in the reflected beam. 
C)  a 180° phase change in the reflected beam. 
D)  a 60° phase change in the reflected beam. 
E)  a 45° phase change in the reflected beam.

Question 18

In a single-slit diffraction experiment, a beam of monochromatic light of wavelength 630 nm is incident on a slit of width 0.400 mm. If the distance between the slit and the screen is 1.80 m, what is the width of the central bright fringe?

Accepted Answer

A)  1.94 mm 
B)  2.94 mm 
C)  3.54 mm 
D)  5.67 mm 
E)  6.94 mm

Question 19

The law of reflection, as well as the law of refraction, can be derived using Huygens' principle.

Accepted Answer

A) True 
 B)False

Question 20

In Young's two-slit experiment, a beam of light from a slit reaches at a point on the screen one wavelength behind the wave from the other slit. What is observed on the screen at that point?

Accepted Answer

A)  Dark fringe 
B)  An empty space 
C)  Bright-dark fringe 
D)  Dark-bright fringe 
E)  Bright fringe

Exam 28: Physical Optics: Interference and Diffraction

When a beam of light, which is traveling in glass, strikes an air boundary, there is

A film of thickness 106 nm soap bubble film (n = 1.42) results in a constructive interference in the reflected light if this film is illuminated by a beam of light with a wavelength of 601 nm. What are the next three thicknesses of this film that will also result in a constructive interference?

Light of wavelength 500 nm illuminates a soap film ( n = 1.33) . What is the minimum thickness of film that will give an interference when the light is incident normally on it?

The limiting angle of resolution for the eye is 1.4 × 10^-⁴ rad. What is the minimum separation between two point sources of light that the eye can distinguish if they are at a distance of 40 m from the observer?

Consider a diffraction grating with 7000. lines/cm with a screen 2.50 m away and 440. nm wavelength light. (a) How many side maxima would be observed on one side of the central maximum? (b) What is the linear distance between the 1st and 2nd maxima?

The wavelength of light is important for thin film interference to occur within the film itself.

A soap bubble has an index of refraction of 1.33. What minimum thickness of this bubble will ensure maximum reflectance of normally incident 530. nm wavelength light?

What is the limiting angle of resolution for the eye if the pupil diameter of the eye is 4.0 mm, a wavelength of light of 600 nm and index of refraction for the eye equal to 1.34?

What is the slit spacing of a diffraction necessary for a 600 nm light to have a first order principal maximum at 25.0°?

If the distance between the slits and the screen is increased in Young's two-slit experiment, which one of the following statements is true of the interference pattern?

If the wavelength of light in Young's two-slit experiment is decreased, which one of the following statements is true of the interference pattern?

A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength is doubled?

A monochromatic beam of light of wavelength 600 nm is incident normally on a diffraction grating with a slit spacing of 1.70 × 10^-⁴ cm. What is the angle for the first order maximum?

Interference is the superposition of two or more waves.

A soap bubble has an index of refraction of 1.33. What minimum thickness of this bubble will ensure maximum reflectance of normally incident 530 nm wavelength light?

When a beam of light, which is traveling in air, is reflected by a glass surface, there is

In a single-slit diffraction experiment, a beam of monochromatic light of wavelength 630 nm is incident on a slit of width 0.400 mm. If the distance between the slit and the screen is 1.80 m, what is the width of the central bright fringe?

The law of reflection, as well as the law of refraction, can be derived using Huygens' principle.

In Young's two-slit experiment, a beam of light from a slit reaches at a point on the screen one wavelength behind the wave from the other slit. What is observed on the screen at that point?