Why speed of light changes from one medium to another
Answers
Answer:
due to refraction of light..when light travels from denser to rarer it bends away from the normal and when it travels rarer to denser it bends towards the normal
However, the speed of light is not constant as it moves from medium to medium. When light enters a denser medium (like from air to glass) the speed and wavelength of the light wave decrease while the frequency stays the same. ... Light moves slower through denser media because more particles get in its way.
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. Light is refracted when it crosses the interface from air into glass in which it moves more slowly.