A scuba diver in a lake aims her underwater spotlight at the lake surface. (a) If the

Question:

A scuba diver in a lake aims her underwater spotlight at the lake surface.
(a) If the beam makes a 75° angle of incidence with respect to a normal to the water surface, is it reflected, transmitted, or both? Find the angles of the reflected and transmitted beams (if they exist).
(b) Repeat for a 25° angle of incidence.