in a glass tumbler with some water if we keep a pencil,why does it appear to be bending ?
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Answer:
refractive index is different for air and water
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Explanation:
A pencil dipped in water in a glass appears to be bent at the interface of air and water due to refraction of light. The refraction of light occurs because the speed of light changes when it goes from one medium to another. Therefore,the pencil will not appear to bend to the same extent when it is dipped in kerosene or turpentine. This is because the refractive index of kerosene or turpentine is different than refractive index of water and hence the speed of light will be different in kerosene than water.
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