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Explain why an empty test tube held obli...

Explain why an empty test tube held obliquely in water appears shiny to an observer looking down.

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When an empty test tube is held obliquely in water in a beaker, some light rays passing from the water to air are incident at an angle greater than the critical angle. They are,thus, totally internally reflected as shown, and the surface of the test tube has a silvery shine.
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