A laser beam is incident on the left mirror. Its initial direction is parallel t
ID: 2206191 • Letter: A
Question
A laser beam is incident on the left mirror. Its initial direction is parallel to a line that bisects the mirrors. What is the angle ? of the reflected laser beam? (Give your answer in degrees if ?=65
Explanation / Answer
The angle between the mirrors is 65 degrees, ==> bisecting angle is 32.5 degrees. When the beam hits the first mirror it is directed off at a 32.5 degree angle. When it hits the second mirror, the beam angle can be found by looking the triangle with angles 64 32.5 and ?. The ? angle is 180-65-32.5 = 82.5 degrees, and this is the angle that the beam is deflected. But you need to find the Phi angle, in that diagram the Phi angle is the deflected angle - 32.5 (the degrees of bisecting angle), So 82.5-32.5 = 50 degrees.
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