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A ray of light falls on the side of a pr...

A ray of light falls on the side of a prism ABC whose refracting angle Is A. The angles of incklence and refraction at the first face AB is `i_1` and `r_1` while at the second face AC is `i_2`` and `r_2` Find the angle of incidence in order that the emer gent ray may just graze the other side. Take A = 60

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