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To begin this solution, let’s zoom in on the geometry. Using geometry of intersecting lines, the angle is represented on both sides of the mirror. The remaining
angles are given their own variable representation. Because the sum of all angles in a right angle is 90 o
(1)
(2)
(3)
Using the law of reflection, the incident and reflected rays have the same angle.
(4) Physics 1202W.100 Fall 2012
Sept. 6th Finally, we use trigonometry to determine the last angle,
(5) ⁄ Using equation (1) and (2) and (4), it’s clear that
(a)
Combining equation (3), (5), (a) yields,
(b) () By solving for , we find that ....
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 Fall '13
 KennethHeller

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