when a pencil is partly emerge in water it appears to be displaced at the interface of air and water. what is cause of it?
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1 Answer. A pencil placed in water appears to be bent because of refraction of light. The refraction causes an apparent shift in the position of the part of the pencil within the water. If water is replaced by another liquid which is optically more dense than water, then the bending of the pencil will increase.
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