The bottom of vessel filled with transparent liquid appears to be concave when viewed obliquely from above. It is due to

Options

A. more and more raising of marginal portions of the bottom than central part due to refraction of light coming from bottom.
B. total internal reflections
C. variations of water due to temperature
D. none of these

Answer

A

Explanation

The object in water appears to be raised more and more than observed more and more obliquely due to refraction of light. In this case too the marginal or the farthest portions of the bottom are raised more and than the central part due to refraction. Thus, the shape of bottom appears concave.