Asked by | 1st May, 2009, 03:27: PM
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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