Electromagnetic Theory-Interference (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 1 - 3 of 4

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Question number: 1

» Electromagnetic Theory » Interference

Appeared in Year: 2012

MCQ▾

Question

Consider the interference of two coherent electromagnetic waves whose electric field vectors are given by Equation and Equation where Equation is the phase difference. The intensity of the resulting wave is given byEquation , where Equation is the time average ofEquation . The total intensity is – (December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

0

d.

Equation

Question number: 2

» Electromagnetic Theory » Interference

Appeared in Year: 2014

MCQ▾

Question

A parallel beam of light of wavelength Equation is incident normally on a thin polymer film with air on both sides. If the film has a refractive indexEquation , then second order bright fringes can be observed in reflection when the thickness of the film is - (December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 3

» Electromagnetic Theory » Interference

Appeared in Year: 2016

MCQ▾

Question

A screen has two slits, each of width Equation , with their centers at a distance Equation apart. It is illuminated by a monochromatic plane wave travelling along the Equation axis.

A screen with two slits

A Screen With Two Slits

Figure shows, a screen has two slits, each of width w.

The intensity of the interference pattern, measured on a distance screen, at an angle Equation to the Equation axis is: (December)

Choices

Choice (4) Response

a.

maximum for Equation

b.

maximum for Equation

c.

zero for Equation

d.

zero for Equation only

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