The index of refraction of water is 1.33. If you (or a fish) were under calm water swimming in the daytime, looking upward you would see a bright circle of light above you at the surface. The circle is because of total internal reflection, and the boundary is where light from below is totally reflected if it is beyond the boundary. What would you see just at the inside edge, where there is the light of the sky coming in? Hint: Camera lenses that produce this effect are called "fisheye" lenses. An image of yourself, because of the law of reflection. Directly overhead, probably the Sun, because the rays in air at that point are perpendicular to the surface. The horizon of the pool or lake, because rays in the air at that position are horizontal and parallel to the surface. The bottom of the lake, reflected in the water., because of total reflection.
The index of refraction of water is 1.33. If you (or a fish) were under calm water swimming in the daytime, looking upward you would see a bright circle of light above you at the surface. The circle is because of total internal reflection, and the boundary is where light from below is totally reflected if it is beyond the boundary. What would you see just at the inside edge, where there is the light of the sky coming in?
Hint: Camera lenses that produce this effect are called "fisheye" lenses.
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An image of yourself, because of the law of reflection. |
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Directly overhead, probably the Sun, because the rays in air at that point are perpendicular to the surface. |
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The horizon of the pool or lake, because rays in the air at that position are horizontal and parallel to the surface. |
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The bottom of the lake, reflected in the water., because of total reflection. |
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