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A ray travels from optically rarer to op...

A ray travels from optically rarer to optically denser medium : `i gt r ::` A ray travels from optically denser to optically rarer medium : ____

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`i lt r` When ray of light travels from optically rarer medium to optically denser medium, the ray of light bends towards the normal hence `i gt r`. When ray of light travels from optically denser medium to optically rarer medium, the ray of light bends away from the normal hence `i lt r`.
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