Wave Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 47 - 51 of 64

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Question number: 47

» Wave Optics » Young's Double Slit Experiment

Assertion-Reason▾

Assertion (Ꭺ)

In Young’s double slit experiment, the fringes become indistinct if one of the slits is covered with cellophane paper.

Reason (Ꭱ)

The cellophane paper decreases the wavelength of light.

Choices

Choice (4) Response

a.

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

b.

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

c.

Ꭺ is true but Ꭱ is false

d.

Ꭺ is false but Ꭱ is true

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Question number: 48

» Wave Optics » Polarization

MCQ▾

Question

When an unpolarised light of intensity I 0 is incident on a polarizing sheet, the intensity of the light which does not get transmitted is

Choices

Choice (4) Response

a.

Zero.

b.

c.

d.

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Question number: 49

» Wave Optics » Interference

MCQ▾

Question

Two coherent sources of intensity ratio 1: 4 produce an interference pattern. The fringe visibility will be –

Choices

Choice (4) Response

a.

1

b.

0.6

c.

0.4

d.

0.8

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Question number: 50

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

MCQ▾

Question

In Fresnel’s biprism experiment the width of 10 fringes is 2cm which are formed at a distance of 2 meter from the slit. If the wavelength of light is 5100 Å then the distance between two coherent sources will be,

Choices

Choice (4) Response

a.

5.1 ×10 -4 mm

b.

5.1 ×10 -4 m

c.

5.1 ×10 -4 cm

d.

10.1 ×10 -4 cm

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Question number: 51

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

MCQ▾

Question

Fraunhoffer diffraction pattern is observed at a distance of 2m on screen, when a plane-wavefront of 6000A is incident perpendicularly on 0.2 mm wide slit. Width of central maxima is:

Choices

Choice (4) Response

a.

12 mm

b.

6 mm

c.

10 mm

d.

None of the above

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