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

Options

A. a) Due to reflection
B. b) Due to refraction
C. Due to diffraction
D. d) Due to total internal reflection

Answer

B

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 . This bending is known as refraction , and it occurs whenever light passes from one transparent medium into another of different density . The eyes do not take refraction into account , but judge the position of the object as if the light came in a straight line.