A pencil partly immersed in water appears broken due to [[1]] of light.

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Detailed Solution

A pencil partly immersed in water appears broken due to refraction of light.
The light ray starting from the tip of the pencil, after refraction at the interface, bends away from the normal as it enters into a less dense medium: air. To the observer, the rays appear to diverge from a point above the pencil's tip. Thus, the immersed part of the pencil now appears from a new depth, resulting in the pencil being bent. A pencil partly immersed in water appears to be broken at the interface of air and water because of the refraction of light.

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