Question #640a9

1 Answer
Mark C.
Nov 4, 2017

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

Explanation:

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.

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