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Asked by  | 1st May, 2009, 03:27: PM

Expert Answer:

This means that it is reflected back along the same path.

Say you hit a ball straight at a wall then it comes back to you along the same straight line. Its just that it now moves in the reverse direction.

Similarly when light is incident normally, on a reflecting surface, it just reverses direction and goes back. So we say that it retraces the path, or in simpler words, it goes back along the same path although in a reverse direction.

Answered by  | 2nd May, 2009, 12:10: PM

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