Question

what is the diffference betw3n denser and rarer medium ?

Answer 1

We can distinguish between them as: 1.Speed of light in rarer medium is faster than in denser medium. 2.When light bends inwards then it is a denser medium and when it bends outwards then it is a rarer medium.

Answer 2

The difference in optically rearer and denser medium is the refractive index. If the medium is denser it means the medium has more refractive index and is more dense and the speed of light isless and vice versa.