Question

2. A ray of light propagates in air (n= 1.33) and strikes a sheet of crown glass (n=1.523). If angle of refraction in glass is 35.2°, determine the angle of incidence. A) 30.3°, B) 32.8°, C) 35.2°, D) 41.20, E) 45.0°

Answer 1

Snell's law states,

sin(x)/sin(y) = n1/n2 , where, x=angle of refraction, y=angle of incidence, n1=refractive index of initial medium, n2=refractive index of final medium.

Here, x=35.2°, n1=1.33, n2=1.523

Therefore, sin(y)= (n2 × sin(x))/n1

y = sin^-1((1.523×sin(35.2))/1.33) = 41.2°

Ans:- D) 41.2°