Question #640a9

1 Answer
Nov 4, 2017

A light ray will bend towards the normal on entering a denser medium.


If you remember it is like throwing a stone into water, you’ll get it right. On entering water the stone slows down, so it bends towards the normal (a line drawn at #90^@# to the interface.)

On leaving the denser medium it bends in the opposite direction.

The only trick is to remember always measure angles relative to the normal.