2) A pencil dipped in water obliquely appears bent at the surface of water.
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When a pencil is partly immersed in water and held in a slanting position, the rays of light coming from the immersed part of the pencil emerge from water (a denser medium) and enter air (a rarer medium). ... Hence, a pencil dipped obliquely in water appears bent at the surface of the water.
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it is due to refraction of light . That's why the pencil appears to be bent .
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