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A ray of light incident on an equilateral glass prism shows minimum deviation of 30^(@). Calculate the speed of light through the prism. |
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Answer» SOLUTION :Here, A ` = 60^(@) , D = 30^(@)` REFRACTIVE INDEX, `n = sin((A+D)/(2))/sin((A)/(2))=sin((60+30)/(2))/(sin((60)/(2)))` `n = (sin45^(@))/(sin30^(@))=((1)/sqrt(2))/((1)/(2))=sqrt(2)` n = 1.414 Velocity of light in GLASS, `v = (c )/(n) = (3xx10^(8))/(1.414)` `v = 2.12 xx 10^(8) ms^(-1)` |
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