Question

Name the phenomenon due to which a swimming pool appears less deep than it really is

Answer 1

Refraction of light.

Answer 2

The "phenomenon" due to which pool appears less deep than it is called the "Refraction of light".

Explanation:

By this phenomenon, the swimming pool appears shallow. The refraction is the abrupt changes in the medium, water to air.

"A pool of water" which is less deep but appears to be very deep, because the light rays from the bottom of the air pool are bent and "pass away from the normal" as they pass from the "water into the air". By this, the pool appears shallower than appearance.