Answer:
A pencil partly immersed in water in
a glass tumbler, it appears to be displaced at the interface of air and water.
The light reaching out from the portion of the pencil inside water seems to
come from a different direction, compared to the part above water due to refraction
of light.
The pencil appear to be bent to the
different extent, if instead of water, liquids like, kerosene or turpentine are
used as their refractive indices are different which in turn produces deviation
from incident ray by different extent.
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