A thin soap film (n = 1.33) is supported in air. The film gives a bright...

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A thin soap film (n = 1.33) is supported in air. The film gives a bright...

A thin soap film (n = 1.33) is supported in air. The film gives a bright fringe when viewed at normal incidence in reflected light with λ = 550 nm. Which of the following might be the thickness of the film?

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Answer 1

Answer #1

For bright fringe constructive interference ie. (2mu)t=(2n+1)lamda/2

2*4/3*t=2n+1(550nm/2)

t=(2n+1)275*3/8

=2n+1(101.125nm)

n is 0,1,2,3....

minimum thickness when n=0

t=101.325nm(minimum thickness)

Other values can be obtained by substituting values of n

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Answer 2

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