A Diver Shines an Underwater Searchlight at the Surface of a Pond

Multiple Choice

A diver shines an underwater searchlight at the surface of a pond (n = 1.33) .At what angle (relative to the surface) will the light be totally reflected?

A) 47.3 $\degree$
B) 41.2 $\degree$
C) 51.1 $\degree$
D) 58.7 $\degree$
E) 49.8 $\degree$