Question

When a ray of light enters a glass slab from air,which quantity does not change?

Answer 1

Answer:

As the speed of light travels from rarer medium to denser medium ,it's speed of light decreases but the frequency remains the same.

The above is your answer......

I have two cases if it helps then your welcome...

Case 1:

When light rays travel from air into glass or from air into water, it bends towards normal. This is because the speed of light rays decrease while travelling from air into glass or water.

Case 2:

When light rays travel from optically denser medium to rarer medium then they bend away from the normal.

Cheers!

Answer 2

Answer:

frequency remains same

but speed decreases when light enter into denser medium.