A light source is located 1.55m below the surface of a swimming pool and 0.545m from one edge of the pool. At what angle does the light reaching the edge of the pool leave the water?

2. You have a piece of diamond (n=2.42) that you submerge in water (n=1.33). For light that is in the diamond, what is the critical angle as it tries to escape into water?
4. A ray of light is incident upon an equilateral triangular glass prism, n=1.5. If the angle of incident is 7.5 at the mid-point of one side, determine the angle at which light leaves the prism.