Wave Optics (NEET Physics): Questions 53 - 57 of 63

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Question number: 53

» Wave Optics » Interference

Assertion-Reason▾

Assertion (Ꭺ)

A 5 % change in wavelength of light received from a star, shows that the star is moving with 0.05 c velocity.

Reason (Ꭱ)

The wavelength of emitted light depends upon the velocity of the source.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is false but Ꭱ is true

Passage

Read the passage given below and answer the questions that follow:

In a Young’s double slit experiment a monochromatic light whose wavelength is λ strikes on the slits, separated by distance d, as shown in the figure. Refractive index of the medium between slits and screen varies with time t as n=n0+kt . Here n 0 and k are positive constants. Position of any point P on screen is measure by its -coordinate as shown.

Young’s double slit experiment

Young’S Double Slit Experiment

In a Young’s double slit experiment a monochromatic light whose wavelength is λ strikes on the slits, separated by distance d, as shown in the figure. Refractive index of the medium between slits and screen varies with time t as n = n0 + kt.

Question number: 54 (1 of 3 Based on Passage) Show Passage

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

The velocity of central maxima at any time t as a function of time t is

Choices

Choice (4) Response

a.

kDsinΦ(n0+kt)

b.

2kDsinΦ(n0+kt)2

c.

kDsinΦ(n0+kt)2

d.

2kDsinΦ(n0+kt)

Question number: 55 (2 of 3 Based on Passage) Show Passage

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

The y co-ordinate of central maxima at any time t is,

Choices

Choice (4) Response

a.

DcosΦ(n0+kt)2

b.

DcosΦn0+kt

c.

DsinΦ(n0+kt)2

d.

DsinΦn0+kt

Question number: 56 (3 of 3 Based on Passage) Show Passage

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

MCQ▾

Question

If a glass plate of small thickness b is placed in front of S 1. How should its refractive index vary with time so that a central maximum is formed at O?

Choices

Choice (4) Response

a.

n0+kt+dsinϕb

b.

n0+ktdsinϕb

c.

n0+kt+2dsinϕb

d.

n0+kt2dsinϕb

Question number: 57

» Wave Optics » Polarization

Assertion-Reason▾

Assertion (Ꭺ)

The unpolarised light and polarised light can be distinguished from each other by using polaroid.

Reason (Ꭱ)

A polaroid is capable of producing plane polarised beams of light.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are false

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

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