Question

what is denser medium and rarer medium ?

Answer 1

Now we'll look at what happens when light travels from a denser medium like glass into a rarer medium like air. 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.

Answer 2

Denser medium is he medium where light travels with lesser speed like in glass
Rarer medium is the medium where light travels with greater speed like air.
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