A ray of light traveling from air into crown glass (n = 1.52) strikes the surface at an angle of

45 degrees. What will the angle of refraction be?

Answer: R = 28 degree

Explanation:

The given parameters are:

Refractive index n = 1.52

Incident angle I = 45 degree

According to Snell law,

Sin I/Sin R = n

Where

I = angle of incidence

R = angle of refraction

n = refractive index

Substitute all the parameters into the formula

1.52 = sin 45 / sin R

Make sinR the subject of formula

Sin R = sin 45/1.52

Sin R = 0.46520

R = sin^-1 (0.46520)

R = 27.72 degree

Therefore, the angle of refraction will be 28 degrees approximately.