Question

A ray of light travels from ethanol into air. If the angle of incidence of the ray at the boundary is 30${}^o$ and the refractive index of ethanol is 1.36, what is the angle of refraction of the ray as it emerges out of ethanol?

Answer 1

Ray is travelling from ethanol to air.

Incidence angle $i={30}^0$

Ethanol refractive index is $n=1.36$

$n\times sini=n_{air}\times sinr$

$1.36sin30=sinr$

$1.36\times 0.5=sinr$

$r={42.8}^o$