Why light travels slower in glass than in air or vacuum?

Question

asked Apr 26, 2021 64.2k views

1 Answer

OllieStanley · Answer 1 · 2021-04-29T23:59:02+0000

Answer:

because of glass' higher refractive index

Step-by-step explanation:

air and vacuum have a lower refractive index and are optically lighter, so light travels faster.

whereas glass has a higher optical density, so light travels slower