Question

light rays travel from vaccum into glass whose refractive index is 1.5. lf angle of incidence is 30° calculate the refraction inside the glass?​

Answer 1

Answer:

since it’s vacuum, refractive index is taken to be 1.

use snell’s law of refraction

n1xsin(i)=n2xsin(r)

n1=1

sin(i)=sin(2r)

n2=1.5

sin(r)=sin(r)

1*sin(2r)=1.5*sin(r)

2sin(r)cos(r)=1.5*sin(r)

cos(r)=1.5/2

cos(r)=0.75

r=cos^-1(0.75)

i=2r

i=2cos^-1(0.75)