Calculating Angle Deflection in Laser-Mirror Interactions

[BuBbLeS01]

Mirror and laser beam angle...please help!

Homework Statement

The mirror deflects a horizontal laser beam by θ=59°. What is the angle φ?

Homework Equations

The Attempt at a Solution

I don't understand this. How am I supposed to figure out φ?

 

[tiny-tim]

I assume φ is the angle of incidence.

Have you drawn a diagram?

What have you drawn … ?

 

[BuBbLeS01]

I have the beam being reflected with lines drawn the upper left and lower left

 

[tiny-tim]

You haven't told us where you've put the 59º in, nor where you've marked φ.

So … where are they?

Anyway, how much are the upper left and lower left angles?