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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
As, `2mut_("min")=(lambda)/(2)`
` :. t_("min")=(lambda)/(4mu)=(750)/(4xx1.33)=141 nm`
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