Problem 25.1.01
A light ray strikes a plane mirror lying flat on a horizontal floor, making an angle of incidence of O; = 64.2º. After reflecting from the mirror, the ray makes a spot on a vertical wall. The wall is a horizontal distance d = 1.08 m from the point of reflection, as shown. How high from the floor is the spot on the wall? (Neglect the thickness of the mirror.)
Homework Answers
BY the law of reflection
Angle of reflection = angle of incidence
= 64.2o
angle that the lower makes with the horizontal = 90 - 64.2 = 25.8o
tan 25.8 = h/d
h = d tan 25.8
= 1.08*tan 25.8
= 0.522 m
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