Question

Why an object appears raised if placed at the bottom of a container filled with water?

Answer 1

Answer:

It happens because of Refraction of the light.

Explanation:

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

Answer 2

Answer:

an object under water appear to be raised because due to refraction of light though the water medium a virtual image