Question

Why the depth of water in a vessel when seen from air appears to be less?​

Answer 1

Answer:

A pool of water appears to be less deep than it actually is because light rays from bottom of pool are bent away from the normal as they pass from water into the air. This makes the pool appear shallower than it really is.

Answer 2

Answer: This may help you

Explanation:

A pool of water appears to be less deep than it actually is because light rays from bottom of pool are bent away from the normal as they pass from water into the air. This makes the pool appear shallower than it really is.

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