Wave Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 52 - 55 of 64

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Question number: 52

» Wave Optics » Huygens' Principle

Assertion-Reason▾

Question

Assertion (Ꭺ)

No interference pattern is detected when two coherent sources are infinitely close to each other.

Reason (Ꭱ)

The fringe width is directly proportional to the distance between the two slits.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

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Question number: 53

» Wave Optics » Interference

Assertion-Reason▾

Question

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

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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 . Here n 0 and k are positive constants. Position of any point P on screen is measure by its -coordinate as shown.

Question number: 54 (1 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.

b.

c.

d.

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Question number: 55 (2 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.

b.

c.

d.

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