Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 326
314 JPmwi. An emergent rays of light a af falling upon atransparent medium A (say a glass prism) will betransmitted through in the direction a />, and de-livered in the direction b b, parallel to a a a.V— angle of incident, v — angle of refraction. Indix of refraction m =■ sin, v … 315 Given the direction of the emergent rays a a\ angles e and r to find the angles u and a;,—or the direction of the rays b V. COS. Z = COS. 6 /toa \ , cos. u=mcos.[ 180—z—r). x = 180 —(e+r+u). When e = u, the angle x is smallest.An eye in V will see the candle in the direc-tion b1 b b. 296 Optic?.
Mechanical engineering · Engineering
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