Question

If the light ray in air enters and passes through a block of glass ,the speed of light remains same. What is that so ? Considering glass is a denser material and light travels slowly in denser medium.

Answer 1

Answer:

Since air is less optically dense than glass, the light wave will slow down upon entering the glass and speed up when exiting the glass. In other words, the light wave will be undergoing the same change in speed as the tractor in the above diagram.