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  • What is the minimum thickness of a soap film needed for constructive interference in reflected light, if the light incident on the film is <img alt="300 \mathrm{~nm}" src="/latex-image/?300%20%5Cma

What is the minimum thickness of a soap film needed for constructive interference in reflected light, if the light incident on the film is 300 \mathrm{~nm} ? Assume that the index for the film is \mathrm{n}=1.33 :

Option: 1

282 nm


Option: 2

70.5 nm


Option: 3

56 nm


Option: 4

37 nm


Answers (1)

best_answer

\mathrm{\begin{aligned} & 2 \mu \mathrm{t}=\frac{\lambda}{2} \\ & \therefore \quad \mathrm{t}_{\min }=\frac{\lambda}{4 \mu}=56\mathrm{~nm} \end{aligned}}

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