The velocities of light in air and glass are 3.0 x 108ms-...
The velocities of light in air and glass are 3.0 x 108ms-1 and 2.0 x 108ms-1 respectively. If the angle of refraction is 30°, the sine of the angle of incidence is
0.33
0.50
0.67
0.75
Correct answer is D
Refractive index
= SiniSinr = Vel. of light in airvel. of light in glass
= SiniSin30o= 3.0×1082.0×108
= Sin i = (3.0×108×Sin30o)2.0×108
= Sin i = (3.0×108×0.5)2.0×108
= 1.52
= 0.75