Why does a water tank filled with water appear shallower when viewed from the top?
Due to refraction
Light rays from the bottom of the tank travel from water (optically denser) to air (rarer), and on crossing the interface they bend away from the normal. The eye traces these refracted rays back in straight lines, locating the bottom at a virtual image closer to the surface.
The relation is \(\mu = \dfrac{\text{real depth}}{\text{apparent depth}}\); since \(\mu_{water} \approx 1.33 > 1\), the apparent depth is less than the real depth. This effect is refraction — not reflection, diffraction, or total internal reflection.
Important Questions from Miscellaneous
The magazine in which Mahatma Gandhi mentioned what he wanted the Constitution to do is:
Which gas shields the surface of the earth from ultraviolet radiation from the sun?
Which event is marked as an Intangible Cultural Heritage of Humanity by UNESCO?
Who has been conferred with the rank of the Commander of the Order of the British Empire in 2018?
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