Question

A pencil immersed obliquely in water appears bent.
Why? What would happen to the bending of pencil if we
replace water with optically denser fluid.

Answer 1

Explanation:

A pencil placed in water appears to be bent because of refraction of light. If water is replaced by another liquid which is optically more dense than water, then the bending of the pencil will increase. This is because the optically denser medium will cause more refraction of light rays.