Question

When light ray travels from denser medium to rarer medium

Answer 1

Answer:

When light travels from a denser medium to a rarer medium, it bends away from the normal, as illustrated to the left. This behavior follows from Snell's Law. As you saw before, the larger angle must be in the medium having the lower index of refraction.

Answer 2

Answer:

when it goes from air to some substance like glass it move from rarer to denser and when it comes out of it , it moves from denser to rarer .