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Refractive index of a thin soap film of ...

Refractive index of a thin soap film of a uniform thickness is 1.38. The smallest thickness of the film that gives an interference maxima in the reflected light when light of wavelength 5520 Å falls at normal incidence is

A

`500 Å`

B

`1500 `Å

C

`1000` Å

D

`2000` Å

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