A ray of light, travelling in a medium of refractive index mu, is incident at an angle i on a composite transparent plate consisting of three plates of refractive indices `mu_1,mu_2 and mu_3.` The ray emerges from the composite plate into a medium of refractive index `mu_4,` at angle x. Then,

Options

A. `sin x=sin i`
B. `sin x=mu/mu_4 sin i`
C. `sin x=mu_4/mu sini`
D. `sin x=(mu_1mu_3mu)/(mu_2mu_2mu_4) sin i`

Answer

B

Explanation

From Snell's law,
`musini=mu_4sinx`
`:. sinx=mu/mu_4 sini`