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?
Homework Answers
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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