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  • What is the minimum thickness of a soap bubble needed for constructive interference in reflected height, if the light incident on the film is <img alt="1500 \mathrm{~nm}" src="/latex-image/?1500%20

What is the minimum thickness of a soap bubble needed for constructive interference in reflected height, if the light incident on the film is 1500 \mathrm{~nm} ? Assume that the refractive index for the film is \mathrm{n}=1.33 :

Option: 1

282 nm


Option: 2

70.5 nm


Option: 3

282 nm


Option: 4

387 nm


Answers (1)

best_answer

We have, \mathrm{ 2 \mu \mathrm{t}=\frac{\lambda}{2}}
\mathrm{ \Rightarrow Minimum \, \, thickness, \mathrm{t}=\frac{\lambda}{4 \mu}=\frac{1500 \times 10^{-9}}{4 \times 1.33}=282 \mathrm{~nm}}

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