# My Science Problems (Part 4)

A boy standing on floor made of mirror has a wall in front of him which is hollow from bottom (as shown in the figure).

Let the maximum mirror that this boy can utilize to see anything on the other side of wall has endpoints $$P$$ and $$Q$$.

Find sum of angle of incidences (in degrees) made by two (separate) light rays falling on $$P$$ and $$Q$$.