Question

A ray of light strike the glass slab at an angle of 40 degree what is the angle of emergence what is angle of refraction

Answer 1

angle of emergence is equal to the ANGLE of INCIDENT because they are corresponding angle .
from, Snell's law
(refractive index of slab) n=sini/sinr
we can find ANGLE 'r' (refraction ANGLE).

Answer 2

Answer:

$angle \: of \: emergence \: is \: equal \: to \: the \: angle \: of \: incident \: because \: they \: are \: corresponding \: angle \: from \: snells \: law \: n = sini \div sinr$