A fish looks up toward the surface of a pond and sees the entirepanorama of clouds, sky

Chapter 9, Problem Problems 5

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A fish looks up toward the surface of a pond and sees the entirepanorama of clouds, sky, birds, and so on, contained in a narrowcone of light, beyond which there is darkness. What is going on hereto produce this vision, and how large is the opening angle of thecone of light received by the fish?

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