In a laser projection system, the optical or scanning angle is related to the throw distance D from the scanner to the screen and

In a laser projection system, the optical or scanning angle θ is related to the throw distance D from the scanner to the screen and the projected image width W by the equation

 

(a) Show that the projected image width is given by

(b) Find the optical angle if the throw distance is 15 feet and the projected image width is 6.5 feet.

csc 0 - cot 0 W = 2D tan