Question

change in the direction of propagation of light explain this​

Answer 1

Answer:

Refraction. Light waves change speed when they pass across the boundary between two substances with a different density, such as air and glass. This causes them to change direction, an effect called refraction. My personal opinion is that light does not move slower through matter, it travels through more space.

Answer 2

Refraction is the change in direction of propagation of a wave when the wave passes from one medium into another, and changes its speed. Light waves are refracted when crossing the boundary from one transparent medium into another because the speed of light is different in different media.

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