Question

A student carries out the experiment of tracing the path of a Ray of light through a rectangular glass slab for the two different values of incidence 30 degree and 45 degree. Find the value of angle of refraction, she is likely to observe in the two cases.?

Answer 1

according to the law of refraction angle of incidence will be equal to angle of emergence
therefore angle of emergence will be 30
and in second case it will be 45

Answer 2

hello there ,

sin i / sin r = refractive index

sin 30 / sin r = 1.5 ( beacuse refractive index of glass is 1.5 ) -- equation 1

also ,

sin 45/ sin r = 1.5 -- equation 2

so solving equation 1 ,

sin r = 0.5/15 = 1/3

and solving equation 2 ,

sinr = 0.707/1.5

on solving we get ,

so r = 20° and r = 28°

for more clarity refer pic attached