Q.

Why does water tank appear shallower when viewed from the top?

A. Due to reflection
B. Due to refraction
C. Due to diffraction
D. Due to total internal reflection
Answer» B. Due to refraction
Explanation: Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
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