REFLEXION OF LIGHT. 41 Let KL, MN (fig. 24) be the two parallel mirrors, P thesource of light. Draw APB perpendicular to the mirrors andproduce it in both directions. A ray PQ falling on the firstmirror at Q is there reflected and appears to come from theimage of P, Take a point Pl on PA produced… … Take P2 in PB produced such that PZB = P,B, then Pa isthe image of Pl in the second mirror. Join PZR, producing itto meet KL in S. RS is the ray reflected once at the secondmirror. The ray is now again reflected in KL and comes fromP3 the image of P2 in the first mirror, P3 being a point on…
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