Wave Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 57 - 61 of 64

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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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Question number: 58

» Wave Optics » Wavefront

MCQ▾

Question

When the light source is moving towards the observer,

Choices

Choice (4) Response

a.

The wavelength of light remains same

b.

The wavelength of light decreases

c.

The velocity of light increases

d.

The wavelength of light increases

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Question number: 59

» Wave Optics » Huygens' Principle

MCQ▾

Question

Two waves originating from source S 1 and S 2 having zero phase difference and common wavelength X will show completely destructive interference at a point P if (S 1 P - S 2 P) is-

Choices

Choice (4) Response

a.

b.

c.

d.

2 λ

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Question number: 60

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

In a Young’s double slit experiment, the separation between the slits is 0.10 mm, the wavelength of light used is 600 nm and the interference pattern is observed on a screen 1.0 m away. Find the separation between the successive bright fringes.

Choices

Choice (4) Response

a.

6 cm

b.

6.6 mm

c.

6 m

d.

6.0 mm

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Question number: 61

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

MCQ▾

Question

Width of slit is 0.3 mm Fraunhofer diffraction is observed in focus plane of lens of a lens of focal length 1 m. If third minima is at 5 mm distance from central maxima, then wavelength of light is-

Choices

Choice (4) Response

a.

5000 Å

b.

7000 Å

c.

6500 Å

d.

6000 Å

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