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What is the minimum thickness of a soap ...

What is the minimum thickness of a soap bubble needed for constructive interference in reflected light, if the light incident on the film is 750 nm? Assume that the refractive index for the film is `n=1.33`

A

282 nm

B

`70.5 nm`

C

141 nm

D

387 nm

Text Solution

Verified by Experts

The correct Answer is:
C
We have `2mut=lambda/2`
`rArr` Minimum thickness,
`t=lambda/(4mu)=(750xx10^(-9))/(4xx4//3)=141nm`
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