Question

why does refraction occur??​

Answer 1

Explanation:

Due to partial reflection and absorption of light at the interface, the intensity of the refracted ray will be less than the incident ray. When the light crosses the boundary between two different media, deviation of light occurs resulting in refraction such that there is a change in wavelength and speed of light.

Answer 2

Explanation:

Refraction is an effect that occurs when a light wave, incident at an angle away from the normal, passes a boundary from one medium into another in which there is a change in velocity of the light. ... Since the light speed changes at the interface, the wavelength of the light must change, too.