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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 750 nm? Assume that the refractive index for the film is `mu=1.33.`

A

282 nm

B

`70.5nm`

C

141nm

D

387 nm

Text Solution

Verified by Experts

The correct Answer is:
C
`2mut=lambda/2`
`:.t_(min)=lambda/(4mu)=141nm`
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