Question

why light slow when pass through medium

Answer 1

It is slow because of the resistance offered by the molecules of the medium in the path of light


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Answer 2

HEY THERE!

As we all know,

Light always travels at the speed of light.
But in a material it travels at the speed of light until it hits an atom. It is then absorbed and re-emitted in the same direction, which takes a small amount of time.
The more it happens, the slower the effective average speed.
The denser the material, the more atoms/elements there are in the way.

HOPE IT HELPED ^_^