Question

Calculate the angle of incidence of light ray on surface of plastic slab of refractive index root 3 if angle of refraction is 30 degree

Answer 1

refractive index=sin i\sinr.     Root 3 =sin i/sin30.                 Sin 30 =1/2.                             root 3=Sin i/1/2.                      Root 3*1/2=sin I.                      root 3/2 = sin i .                         Sin 60 = root 3/2.               Hence and is 60.