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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? A

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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. `70.5nm`
C. 141nm
D. 387 nm
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Correct Answer - C
`2mut=lambda/2`
`:.t_(min)=lambda/(4mu)=141nm`
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