Wave Optics (NEET Physics): Questions 31 - 35 of 64

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Question number: 31

MCQ▾

Question

A slit of size 0.15 cm is placed at 2.1 m from a screen. On illuminating it by a light of wavelength 5 × 10 -5 cm, the width of central maxima will be

Choices

Choice (4) Response

a.

70 mm

b.

0.14 cm

c.

1.4 mm

d.

0.14 mm

Question number: 32

MCQ▾

Question

In Fresnel’s biprism experiment distance of m th bright fringe from zeroth order fringe will be –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 33

» Wave Optics » Wavefront

MCQ▾

Question

Red light of wavelength 6500 Å from a distant source falls on a slit 0.5 mm wide. What is the distance between two dark bands on each side of central bright band of diffraction pattern observed on a screen placed 1.8 m from the slit?

Choices

Choice (4) Response

a.

4.68 ×10 -3 mm

b.

4.68 × 10 -3 nm

c.

4.68 × 10 -3 cm

d.

4.68 × 10 -3 m

Question number: 34

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

In Young’s experiment the wavelength of red light is 7.5 × 10 -5 cm. and that of blue light 5.0 × 10 -5 cm. The value of n for which (n + l) th blue bright band coincides with n th red bright band is-

Choices

Choice (4) Response

a.

8

b.

4

c.

1

d.

2

Question number: 35

» Wave Optics » Interference

MCQ▾

Question

The intensities of two light sources are I and 9I respectively. If the phase difference between the waves emitted by them is π then the resultant intensity at the point of observation will be –

Choices

Choice (4) Response

a.

3I

b.

10I

c.

82I

d.

4I

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