Question

The diagram shows rays of light from a point source, P, that reach a detector, D, along two paths. One path is a straight line, while the other is bent by reflection off a mirror. What is the value of b, correct to one decimal place? Assume that all the points in the diagram lie in the same plane.
5.4



4.2



3.6



2.8

Answer 1

The answer is C) B = 3.6.

Hope this helps and p.s. I have done this before.