Question

Light incident upon a pane of glass slows down in passing through the glass, Does it emerge at a slower speed or at its initial speed?

Answer 1

Answer:

It will emerge at its initial speed not a slower speed.

Explanation:

It will emerge at the initial speed because the medium at the point of emergence is the same as the medium before incidence.

Light moves at a constant speed in any particular medium. Hence, the speed of light in air is constant in air and the speed of light in glass is constant in glass.