Physics
posted by Jordan .
Which of the following is correct for the reflected ray if a light ray strikes a plane mirror at an angle of 50° from the normal?
a. 40° from the surface of the mirror
b. 40° from the normal
c. 50° from the surface of the mirror
d. 90° from the normal
I have been stuck on this question for a while and I think it is because I am not sure I truly understand the question so I am not entirely convinced that I know the correct answer. I think the answer is either 40 degrees from the normal or 90 degrees from the normal but I do not know for sure. If you could help me answer this question and explain it to me it would be greatly appreciated.

The angle of reflection is the same as the angle of incidence.
Since incidence is 50° from the normal, so is the reflection.
Since the normal is 90° from the surface,
50° from normal = 40° from surface
So, the answer is (a)