Question

A ray of light passes from air into a liquid The glancing angle is $30$ The deviation produced in the ray of light is $15$ The refractive index of liquid is;

Answer 1

As Light passes from air into a liquid the deviation $=i-r$
so $i-r=19°$
and $i=52°$
so $r=52-19=33°$
so refractive index of the liquid $=\frac{sini}{sinr}=\frac{sin52°}{sin33°}=\frac{0.7880}{0.5446}=1.45$ (approx)