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Why does a ray of light bend when it travels from one medium to another?
A ray of light bend when it travels from one medium to another because of the phenomenon, commonly known as the refraction of light. It occurs due to the change in the speed of light going from one medium to another.
Explanation
Refraction is the process of bending of light when light travels from one medium to another medium. The angle of refraction or the amount of bending of light depends on the densities or refractive index
1. When light passes through a low refractive index, like air (faster medium or optically rarer medium) to a high refractive index, like glass(slower medium or optically denser medium), its speed decreases and bends towards the normal.
2. When light passes through a high refractive index, like glass (slower medium or optically denser medium) to a low refractive index, like air (faster medium or optically rarer medium) its speed increases and bends away from the normal.