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Why does a ray of light bend towards nor...

Why does a ray of light bend towards normal as it passes from air to glass ?

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As `mu = (sin i)/(sin r) = ( c)/(v)`, and speed of light in glass (v) lt speed of light in air ( c)
`:. sin r lt sin I or r lt i`. Hence a ray of light bends towards normal as it passes from air to glass.
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PRADEEP-RAY OPTICS-Conceptual problem(b)
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