Question

A ray of light propagates from glass (refractive index = 3/2) to water ( refractive index = 4/3). The value of the critical angle
(1) sin-(1/2)
(2) sin 9
(4) sin-(5/7)
(3) sin-1(8/9)​

Answer 1

Answer:

Here, Glass is denser medium : n1=

$\frac{3}{2}$

Water is rarer medium : n2=

$\frac{4}{3}$

Light travels from denser to rarer medium.

Let α be the critical angle.

Now,

sin α=3/2/4/3

sin α=3/2*3/4

sin α=9/8

α=sin-1(8/9)

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