The Brwster angle of the glass-air interface is ` 54.74^(@)`. If a ray of light going from air to glass strikes at an angle of incidence ` 45^@`, then the angle of refraction is

Options

A. `60^(@)`
B. `30^(@)`
C. `25^(@)`
D. `54.74^(@)`

Answer

B

Explanation

The R.I. (n)`=tani_p= tan 54.74^(@)=sqrt(2)`
By Snell's law `n=(sin i)/(sin r)`
`:. sin r=(sin i)/(n)=((1)/(sqrt(2)))/(sqrt(2))=(1)/(2) :. r=30^(@)`