Wave Optics Test

Result

Wave Optics Test - 17

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Weekly Quiz Competition

Question 1
4 / -1

A fringe width of a certain interference pattern is 13 = 0.002 cm. What is the distance of 5th dark fringe from centre?

A
9 × 10^-3 cm

B
11 × 10^-2 cm

C
1.1 × 10^-2 cm

D
3.28 × 10^-6 cm

Solution
Question 2
4 / -1

A light source, which emits two wavelengths λ₁ = 400 nm and λ₂ = 600 am, is used Young's double slit experiment. If recorded fringe widths for λ₁ and λ₂ are β₁ and β₂ and the number of fringes for them within a distance y on one side of the central maximum are m₁ and m₂ respectively, then

A
β₂ > β₁

B
m₁ > m₂

C
from the central maximum, 3rd maximum of λ₂ overlaps with 5th minimum of λ₁.

D
the angular separation of fringes of λ₁ is greater than λ₂.
Question 3
4 / -1

In a Young's double slit experiment, the slit separation is 1 mm and the screen is lm from the slit. For a monochromatic light of wavelength 500 nm, the distance of 3rd minima from the central maxima is

A
0.50 mm

B
1.25 mm

C
1.50 mm

D
1.75 mm
Question 4
4 / -1

Consider the following statements in case of Young's double slit experiment.
I. A slit S is necessary, if we use an ordinary extended source of light.
II. A slit S is not needed, if we use an ordinary but well collimated beam of light.
III. A slit S is not needed, if we use a specially coherent source of light.
Which of the above statements are correct?

A
I and III

B
II and III

C
I and II

D
I, II and III
Question 5
4 / -1

In Young's double slit experiment the two slits are d distance apart. Interference pattern is observed on a screen at a distance D from the slits. A dark fringe is observed on the screen directly opposite to one of the slits. The wavelength of light is

A

B

C

D
Question 6
4 / -1

Young's double slit experiment is carried out by using green, red and blue light, one colour at time. The fringe widths recorded are β_G , β_R and β_B respectively. Then,

A
β_G > β_R > β_B

B
β_B > β_G > β_R

C
β_R > β_B > β_G

D
β_R > β_G > β_B
Question 7
4 / -1

In Young's double slit experiment, fringes of width (3 are produced on a screen kept at a distance of 1 m from the slit. When the screen is moved away by 5 × 10^-2 m, fringe width changes by 3 × 10^-5 m. The separation between the slits is 1 ×10^-3 m. The wavelength of the light used is ... nm.

A
400

B
500

C
600

D
700
Question 8
4 / -1

A
3 : 2

B
2 : 1

C
√2 : 1

D
4 : 1

Solution
Question 9
4 / -1

A
4

B
2

C
1

D
0.5
Question 10
4 / -1

In an interference experiment, phase difference for points where the intensity is minimum is (n =1, 2, 3, ... )

A
nπ

B
(n + 1)π

C
(2n – 1)π

D
zero