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A ray of light passes from glass to air at an angle of `19.5^@`. Calculate the angle of refraction, given refractive index of glass w.r.t. air is `3//2`.

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As the ray passes from glass to air,
`:. n = sin r/sin i=1.5`
`sin r = n sin i=1.5 sin 19.5^@`
`=3/2 xx 0.3333=0*5`
`r =30^@`.

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