Question

what are the causes of refraction

Answer 1

speed of light is different media.it is lesser in denser medium and higher in rarer medium.so,when light enters a denser medium,its speed reduces amd it bends towards the normal and when it enters rarer medium ,its speed increases and it bends away from the normal.




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Answer 2

Refraction is caused due to the change in the speed of light while entering a different medium.

For example if light is going from air to water , it's speed decreases due to change in refractive tuve index of the medium so it bends towards the normal .

Rarer to Denser is away from the normal

Hope it clears a bit.