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Why does a ray of light while passing th...

Why does a ray of light while passing through a prism, bend towards its base?

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When a ray of light passes through a prism, it under goes refraction twice. First from rarer to denser medium of glass, it bends towards normal which is towards the base of the prism. Second time from denser to rarer medium, i.e., glass to air, it bends from the normal, i.e., towards the base of the prism.
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