A horizontal meter stick is centered at the bottom of a 3.0-mm-deep, 3.0-mm-wide pool of water. Suppose you place your eye just above the edge of the pool and look along the direction of the meter stick.

a) What angle do you observe between the two ends of the meter stick if the pool is empty?

b) What angle do you observe between the two ends of the meter stick if the pool is completely filled with water?