Physics 102Assignment 3 Problems (Spring Term)1. Light is incident normally on a 1.00-cm layer of water that lies on top of a flat Luciteplate with a thickness of 0.500 cm. How much more time is required for light topass through this double layer than is required to traverse the same distance inair (nLucite= 1.59)?( t = 2.09 x 10-11s )2. A submarine is 300 m horizontally out from the shore and 100 m beneath the surfaceof the water. A laser beam is sent from the sub so that it strikes the surface of thewater at a point 210 m from the shore. If the beam just strikes the top of abuilding standing directly at the water’s edge, find the height of the building.( h = 107 m )3. A ray of light strikes the midpoint of one face of an equiangular (60°-60°-60°) glassprism (n = 1.5) at an angle of incidence of 30°. (a) Trace the path of the light raythrough the glass, and find the angles of incidence and refraction at eachsurface. (b) If a small fraction of light is also reflected at each surface, find theangles of reflection at these surfaces.