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In the above example, find the angle of incidence at face AB, so that emergent ray grazes along the face AC'. |
Answer» SOLUTION :Calculation of angle of incidence at face AB. At face AC, let the angle of incidence be `r_(2)`, For grazing ray `e=90^(@)` `impliesmu=1/(sinr_(2))=r_(2)=SIN^(-1)(1/(sqrt(2)))=45^(@)` Let angle of REFRACTION at face AB be `r_(1)` Now `r_(1)+r_(2)=A` `:.R_(1)=A-r_(2)=60^(@)-45^(@)=15^(@)` Let anle of incidence at this face be i `MU=(sini)/(sinr_(1))` `impliessqrt(2)=(sini)/(sin 15^(@))` `:.i=sin^(-1)(sqrt(2).sin 15^(@))` |
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