1. An optical lever is a convenient device to magnify a small displacement, making possible an accurate measurement of the displacement. The plate P carries a mirror. The mirror mount has two points resting in a fixed groove, F, and at the other end has a point resting on a flat surface whose vertical displacement AL you are measuring. A horizontally propagating laser beam is reflected from the mirror and its vertical position y is measured with respect to the original beam direction. If AL 10 m, d= 10 cm, and D 1 m, what is the value of y? Laser Scale Minor AL