Question

Why does ray of light coming through denser medium bend when it
enters into rarer medium?​

Answer 1

It actually depends on the angle at which the incident ray hits the boundary face between both mediums

So if the incident ray coming from an angle enters the rarer medium it causes the refracted ray to bend away from the line of the normal

Step-by-step Step-by-step explanation:

I hope it was of help I tried explaining the best I could

Answer 2

this occurs as a result of different refractive index of the two media