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Considering normal incidence of ray, the...

Considering normal incidence of ray, the equivalent refractive index of combination of two slabs shown in Fig. is.
.

A

`1.8`

B

`1.43`

C

`2`

D

none of the above

Text Solution

Verified by Experts

The correct Answer is:
B
`mu_(eff) = (t_(1) + t_(1))/((t_(1))/(mu_(1)) + (t_(2))/mu_(2)) = (10 + 15)/((10)/(4//3) + (5)/(3//2)) = (25)/(7.5 + 10) = 1.43`
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