Question

Why does a fish inside water cannot see the entire surface?

Answer 1

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$\textbf{ Why does a fish inside water cannot see the entire surface? }$

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Actually, the fish can see the entire surface . The problem is that he sees all the rays from the air above as coming in a maximum angle of 48.6 degrees from the normal to the air/water interface, so it looks like a circular region. Snells law makes this clear.

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Answer 2

The light grey area is the air it is about the water surfaceFull stop the green area is below the water surface a fish with two eyes is under the water surfaceAll the light from the world about waterSurface that fishIntas the water through a low surface I hope  it will be helpful for you