Question 1

In a Young's double-slit interference apparatus,the distance from the slits to the screen is doubled.The distance between adjacent light and dark fringes changes by a factor of:

Accepted Answer

A) 1/4. 
B) 1/2. 
C) 1. 
D) 2. 
E) ​4.

Question 2

A light source simultaneously emits light of two wavelengths,460 nm and 654 nm,respectively.The source is used in a double-slit interference experiment where the slit spacing is a 0.0431 mm,and the distance between double slits and the screen is 0.90 m.What is the separation between the second-order bright fringes of the two wavelengths as they appear on the screen? (1 nm = 10−9 m)

Accepted Answer

A) 4.1E-3 m 
B) 2.1E-3 m 
C) 8.1E-3 m 
D) 6.9E-3 m 
E) 4.7E-2 m

Question 3

Upon reflection,light undergoes a 180° phase change:

Accepted Answer

A) always. 
B) if the incident medium has the higher index of refraction. 
C) if the incident medium has the lower index of refraction. 
D) whenever the incident angle is less than the critical angle.

Question 4

Two closely spaced parallel glass plates are separated by 977 nm.What wavelength light source in the visible region (390 nm to 710 nm)will experience maximum transmission through the two plates?

Accepted Answer

A) 651 nm 
B) 695 nm 
C) 655 nm 
D) 618 nm 
E) ​601 nm

Question 5

Laser light sent through a double slit produces an interference pattern on a screen 3.00 m from the slits.If the eighth-order maximum occurs at an angle of 63.4°,at what angle does the third-order maximum occur?

Accepted Answer

A) No third-order maximum occurs. 
B) 0.34° 
C) 19.6° 
D) 23.8° 
E) Not enough information is given.

Question 6

A diffraction grating with 11 800 lines/cm will exhibit the first-order maximum for light of wavelength 416 nm at what angle? (1 nm = 10−9 m)

Accepted Answer

A) 0.513° 
B) 0.281° 
C) 58.8° 
D) 29.4° 
E) 15.1°

Question 7

Unpolarized light of intensity I0 passes through two sheets of ideal polarizing material.If the transmitted intensity is 0.24 I0,what is the angle between the polarizer and the analyzer?

Accepted Answer

A) 61° 
B) 46° 
C) 61°. 
D) 76° 
E) 0.81°

Question 8

Diffraction grating №1 has half the lines/cm that diffraction grating №2 does.When used with a certain wavelength of light,both gratings give first-order maxima.Which of the following statements is true for the same wavelength of light.

Accepted Answer

A) Both gratings must also give second-order maxima. 
B) Grating №1 must give a second-order maximum. 
C) Grating №2 must give a second-order maximum. 
D) It is possible that neither grating gives a second-order maximum.

Question 9

A soap bubble (n = 1.35)is floating in air.If the thickness of the bubble wall is 328 nm,which of the following wavelengths of visible light is strongly reflected?

Accepted Answer

A) 621 nm (orange) 
B) 547 nm (green) 
C) 590 nm (yellow) 
D) 707 nm (red) 
E) ​429 nm (violet)

Question 10

In a Young's double-slit experiment,both the wavelength and the slit separation are increased by 50%.What happens to the distance between two adjacent bright fringes?

Accepted Answer

A) It increases by 50%. 
B) It decreases by 50%. 
C) The distance stays the same. 
D) The distance increases by a 100% or more.

Question 11

A Young's double-slit experiment is performed in air and then the apparatus is submerged in water.What happens to the fringe separation,and what can be used to explain the change,if any?

Accepted Answer

A) The separation stays the as it is the same experiment independent of the medium. 
B) The separation decreases because the frequency of the light decreases in the water. 
C) The separation increases because the wavelength of the light increases in the water. 
D) The separation decreases because the wavelength of the light decreases in the water.

Question 12

Why are sound waves not polarizable?

Accepted Answer

A) Because they are not electromagnetic. 
B) They are not transverse. 
C) They are not longitudinal. 
D) But this is readily possible!

Question 13

That light can undergo interference is evidence that it:

Accepted Answer

A) has electric properties. 
B) is made of corpuscles. 
C) behaves like a wave. 
D) has a phase of 180°.

Question 14

A Young's double-slit apparatus is set up.A screen is positioned 1.30 m from the double slits,and the spacing between the two slits is 0.0392 mm.The distance between alternating bright fringes is 1.16 cm.What is the light source wavelength? (1 nm = 10−9 m)

Accepted Answer

A) 312 nm 
B) 346 nm 
C) 321 nm 
D) 350 nm 
E) 325 nm

Question 15

What is the highest-order (m value)maximum for wavelength 450 nm that can be obtained with a grating with 300 lines per mm?

Accepted Answer

A) 8 
B) 3 
C) 7 
D) 4

Question 16

A material is optically active if it:

Accepted Answer

A) absorbs light passing through it. 
B) transmits all light passing through it. 
C) exhibits interference. 
D) rotates the plane of polarization of the light passing through it.

Question 17

Interference effects observed in the early 1800s were instrumental in supporting a concept of the existence of which property of light?

Accepted Answer

A) polarization 
B) particle nature 
C) wave nature 
D) electromagnetic character

Question 18

In a single-slit diffraction experiment,the width of the central maximum is 6.0 mm.The width of the slit is then doubled as is the distance to the screen.What is the resulting width of the central maximum?

Accepted Answer

A) 12 mm 
B) 6.0 mm 
C) 24 mm 
D) 3.0 mm

Question 19

In a Young's double-slit experiment,by how many wavelengths do the paths from the slits to the screen differ for the m = 3 and the m = 8 minima?

Accepted Answer

A) 10 
B) 2.5 
C) 5 
D) Some other value than those given since this is for destructive interference.

Question 20

A laser shines 630-nm light through a grating producing a first-order (m = 1)maximum at an angle of 30°.A second laser produces a first-order maximum with the same grating at 20°.What is the wavelength emitted by the second laser?

Accepted Answer

A) 945 nm 
B) 651 nm 
C) 420 nm 
D) 431 nm

Exam 24: Wave Optics

In a Young's double-slit interference apparatus,the distance from the slits to the screen is doubled.The distance between adjacent light and dark fringes changes by a factor of:

Upon reflection,light undergoes a 180° phase change:

Two closely spaced parallel glass plates are separated by 977 nm.What wavelength light source in the visible region (390 nm to 710 nm) will experience maximum transmission through the two plates?

Laser light sent through a double slit produces an interference pattern on a screen 3.00 m from the slits.If the eighth-order maximum occurs at an angle of 63.4°,at what angle does the third-order maximum occur?

A diffraction grating with 11 800 lines/cm will exhibit the first-order maximum for light of wavelength 416 nm at what angle? (1 nm = 10−⁹ m)

Unpolarized light of intensity I₀ passes through two sheets of ideal polarizing material.If the transmitted intensity is 0.24 I₀,what is the angle between the polarizer and the analyzer?

Diffraction grating №1 has half the lines/cm that diffraction grating №2 does.When used with a certain wavelength of light,both gratings give first-order maxima.Which of the following statements is true for the same wavelength of light.

A soap bubble (n = 1.35) is floating in air.If the thickness of the bubble wall is 328 nm,which of the following wavelengths of visible light is strongly reflected?