A ray of light is incident at an angle i on a glass slab of refractive index µ. The angle between reflected and refracted light is 90°. Then, the relationship between i and µ is
tan i = µ
sin i = µ
cos i = µ
When light is refracted from a surface, which of its following physical parameters does not change ?
Velocity
Amplitude
Frequency
Wavelength
C.
Frequency
When light is refracted its frequency will remain unchanged.