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Find the angle of incident at face AB so that the emergent ray grazes along the face AC. |
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Answer» Solution :CRITICAL angle, `theta_(c) = sin^(-1) ((1)/(mu)) = r_(2)` `therefore " " theta_(c) = sin^(-1) ((1)/(sqrt(2))) = 45^(@)` `A = r_(1) + r_(2)` `therefore " " r_(1) = A - r_(2) = 60^(@) - 45^(@) = 15^(@)` CONSIDERING refractionat face AB, `mu = (sini_(1))/(sinr_(1))` `therefore " " sini_(1) = musinr_(1) = sqrt(2)xx sin15^(@)` `therefore " " sini_(1) = musinr_(1) = sqrt(2)xx sin15^(@)` 
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