Sunlight enters a room at an angle of = 27 above the horizontal and reflects from a small mirror lying flat on the floor. The reflected light forms a...

Sunlight enters a room at an angle of θ = 27° above the horizontal and reflects from a small mirror lying flat on the floor. The reflected light forms a spot on a wall that is d = 1.8 m behind the mirror, as shown in the figure. If you now place a pencil under the edge of the mirror nearer the wall, tilting it upward by 5.0°, how much higher on the wall (Δy) is the spot? answer in cm  please

http://www.webassign.net/walker/26-42alt.gif