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

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Question number: 1

» Electromagnetic Theory » Interference

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Appeared in Year: 2012

MCQ▾

Question

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

Choices

Choice (4)Response

a.

b.

c.

0

d.

Question number: 2

» Electromagnetic Theory » Interference

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Appeared in Year: 2014

MCQ▾

Question

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

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 3

» Electromagnetic Theory » Interference

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Appeared in Year: 2016

MCQ▾

Question

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

A screen with two slits

A Screen with Two Slits

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

Choices

Choice (4)Response

a.

zero for only

b.

maximum for

c.

maximum for

d.

zero for

Question number: 4

» Electromagnetic Theory » Interference

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Appeared in Year: 2016

MCQ▾

Question

A pair of parallel glass plates separated by a distance is illuminated by white light as shown in the figure below. Also shown is the graph of the intensity of the reflected light as a function of the wavelength recorded by a spectrometer.

A pair of parallel glass plates

A Pair of Parallel Glass Plates

Intensity of the reflected light as afunction of the wavelength

Intensity of the Reflected Light as Afunction of the Wavelength

Assuming that the interference takes place only between light reflected by the bottom surface of the top plate and the top surface of bottom plate, the distance is closest to: (December)

Choices

Choice (4)Response

a.

b.

c.

d.

Developed by: