Question

Light changes direction as it passes from one medium to another. This phenomenon is called

A	reflection

B	diffraction

C	refraction

D	retraction

Answer 1

Option (C). Refraction'

In optics, refraction is a phenomenon that often occurs when waves travel from a medium with a given refractive index to a medium with another at an oblique angle. At the boundary between the media, the wave's phase velocity is altered, usually causing a change in direction. Its wavelength increases or decreases, but its frequency remains constant.For example, a light ray will refract as it enters and leaves glass, as there is a change in refractive index.