Question

why bottom of a beaker filled with water appears raised?​

Answer 1

Answer:

As light passes from water (denser medium) to air (rarer medium) it bends away from the normal, this creates the illusion of raised bottom.

Explanation:

This occurs due to a phenomenon called REFRACTION.

As light passes from water (denser medium) to air (rarer medium) it bends away from the normal, this creates the illusion of raised bottom.

Answer 2

Bottom of a beaker filled with water appears raised because:

• The rays originating from the bottom of the beaker undergo refraction at the air-water interface.

• The refracted rays are deviated away from the normal.

• As a result, when the refracted ray is extrapolated (i.e. extended backwards), the level of the bottom of the beaker appears raised.

Similarly, when a coin is placed at the bottom of a water filled container, the coin appears raised.

$\star$ See the diagram