Which statement is correct? A The speed of light in glass is equal to the speed of light in a vacuum multiplied by the
refractive index of glass.

B The incident angle of a light ray at an air-glass surface is the angle between the ray and the
glass surface.

C The sine of the critical angle at an air-glass surface is equal to
refractive index of glass

D The angle of refraction for light passing through an air-glass surface is proportional to the
angle of incidence at that surface.​