Question

The bottom of the tank appears to be concave due to *​

Answer 1

Answer:

In tank :

When light travels through one medium to another, as when it passes through water and then air, its path bends. That phenomenon is known as refraction, which creates the illusion that the bottom of the tank is not where we know it is.It appears to be raised and concave.

Explanation:

i hope it's helpful...