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When light is incident on a soap film of...

When light is incident on a soap film of thickness `5xx10^(-5)` cm, the wavelength of light reflected maximum in the visible region is 5320 Å. Refractive index of the film will be,

A

1.22

B

1.33

C

1.51

D

1.83

Text Solution

Verified by Experts

The condition for constructive interferene, (for reflection)
`2mut cos r = (2n+1) lambda/2, [therefore cos r=1]`
`mu =((2n+1)lambda)/(4t)`
For visible region, n=2
`mu =(2(2)+1 xx 5320 xx 10^(-10))/(4 xx 5000 xx 10^(-10)) = 1.33`
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