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  • When light is incident on a soap film of thickness <img alt="5 \times 10^{-5} \mathrm{~cm}" src="https://entrancecorner.oncodecogs.com/gif.latex?5%20%5Ctimes%2010%5E%7B-5%7D%20%5Cmathrm%7B%7Ecm%7D"

When light is incident on a soap film of thickness 5 \times 10^{-5} \mathrm{~cm}, wavelength reflected maximum in the visible region is 5320 \AA. Refractive index of the film will be

Option: 1

1.22


Option: 2

1.33


Option: 3

1.51


Option: 4

1.83


Answers (1)

\mathrm{2 \mu t \cos r=(2 n+1) \frac{\lambda}{2} }
\mathrm{\text { or } \mu=\frac{(2 n+1)}{2 t \cos r} \frac{\lambda}{2}=\frac{(2 n+1) \times 5320 \times 10^{-10}}{2 \times 5 \times 10^{-5} \times 10^{-2} \times 1} }

\mathrm{\Rightarrow \mu=1.33 }

Posted by

Kshitij

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