Why does angle of straight stick change if we deep it into water???
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Water has higher refractive index than air which causes refraction. Due to the change in medium the speed of light decreases. The refraction causes difference in speed of light the stick kept in water appears to be bent or broken.
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When stick is immersed partly in water then light coming from stick refracts at the surface of water due to change in density of medium. The part of stick above water is in same medium as your eyes are in, so light travels along straight line showing orignal shape of stick
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