Question

The refractive index for a glass is 1.62 the sine of the critical angle for total internal reflection at a glass air interfernce

Answer 1

Sin i(critical angle)=1/μ

So the sin of critical angle at the glass air interference is 1/1.62= 0.617.

So i = sin inverse 0.617

Answer 2

Can you please tell from which book you have taken this question ?