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प्रश्न
Find a critical angle for glass and water pair, given the refractive index of glass, is 1 ·62 and that of water is 1 ·33.
उत्तर
`omega^(mug)` = R.I of glass w.r.t water
=`(mug)/(muomega)`
`omega^(mug) = 1.62/1.33`
∴ sin c = `133/1.62 = 0.82`
∴ c = Critical angle = sin-1 0.82 = 55°
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