Question

Why light change its direction with change in its medium ​

Answer 1

Explanation:

Because when the light goes from one to another medium, the refractive index of the second medium changes the direction of light.

This can be explained well on the microscopic level. You should also check out about it in 10th class science book of any syllabus.

Answer 2

Explanation:

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.

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