Which phenomenon of light makes the water to appear shallower than it really is?

Refraction of light is the phenomenon due to which the water appears shallower than it really is.


Refraction is the process of bending of light, when light travels from one medium to another medium. The bending of light is caused due to the differences between the densities of the two mediums. 

When we look into a water tank, we do not see the actual bottom of the tank, we see a virtual image of the bottom of the tank which is formed by the refraction of light coming from the water into the air. Thus, the water tank appears less deep or shallower than it really is.


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