Electromagnetic Theory-Interference (CSIR Physical Sciences): Questions 1 - 2 of 2

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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 E1=i^E0cosωt and E2=j^E0cos(ωt+ϕ) where ϕ is the phase difference. The intensity of the resulting wave is given by ε02E2 , where E2 is the time average of E2 . The total intensity is – (December)

Choices

Choice (4) Response

a.

ε0E02cos2ϕ

b.

ε0E02sin2ϕ

c.

0

d.

ε0E02

Question number: 2

» Electromagnetic Theory » Interference

Appeared in Year: 2014

MCQ▾

Question

A parallel beam of light of wavelength λ is incident normally on a thin polymer film with air on both sides. If the film has a refractive index n>1 , then second order bright fringes can be observed in reflection when the thickness of the film is - (December)

Choices

Choice (4) Response

a.

3λ4n

b.

λ2n

c.

λ4n

d.

λn

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