(a) A man standing on the edge of a swimming pool looks at a stone lying on the

ID: 2253094 • Letter: #

Question

(a) A man standing on the edge of a swimming pool looks at a stone lying on the bottom.

The depth of the swimming pool is h. At what distance from the surface of water is the

image of the stone formed if the line of vision makes an angle with the normal to the

surface?

(b) The stone above turns out to be a glow-stone" that starts glowing isotropically (i.e.

gives out light equally in all directions) at night. What is the radius of the illuminated

disc on the surface of water as seen by a person standing outside the water? (Hint: First

try to explain why there will be such a disk.)

(a) A man standing on the edge of a swimming pool looks at a stone lying on the

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