The two mirrors in Figure P22.6 meet at a right angle. The beam of light in the

Question

The two mirrors in Figure P22.6 meet at a right angle. The beam of light in the vertical plane P

strikes mirror 1 as shown. (a) Determine the distance the reflected light beam travels before

striking mirror 2. (b) In what direction does the light beam travel after being reflected from mirror

2?

Part B

If the angle between the mirrors is increased to 120 degrees, what is the angle made by the reflected light ray (with respect to horizontal) from mirror 2?

Explanation / Answer

a) distance travelled = 1.25m sec 50 degree = 1.94m

b) angle of incidence at mirror 2 = 90-(180-90-50) = 50 degree

angle of reflection from mirror 2 = 50 degree with horizontal

part B

Angle of incidence on mirror 2 = 90- (180-120-50) = 80 degree

Angle at which it is reflected with horizontal = 120 -(90-80) =110 degrees with horizontal

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