Question

why the coin placed on the glass beaker appears above the water level​

Answer 1

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• This bending of light, called refraction, causes the apparent position of the coin to change to a shallower position. The light bends when it passes from water to air on top of the water. It does the same thing when it passes through the glass, making the coin appear to be closer to you.

Answer 2

Light bends when it passes from one medium (water) into another medium of a different density (air).

This bending of light, called refraction, causes the apparent position of the coin to change to a shallower position1 (see diagram).

The light bends when it passes from water to air on top of the water.