376 Image FormationP36.72(a)The lens makers’ equation,111112fnRR=−+FHGIKJafbecomes: 150011900111 0...cmcmcm−−LNMOQPngiving n=199..(b)As the light passes through the lens for the first time, the thin lens equation111pqf+=becomes:18001cmcmqorq113 3=. cm,andMqp11113 3167..cm8.00 cm.This image becomes the object for the concave mirror with:m=−=20 020 013 36 671..cmcmcmcmandfR==+2400. cm.The mirror equation becomes:1667cmcmqmgivingqm=10 0cmandMqpmm210 0150..cm6.67 cm.The image formed by the mirror serves as a real object for the lens on the second pass of thelight through the lens with:m320 010 0=+cmcm.The thin lens equation yields:110 03cmcmqorq310 0=andMqp33310 0100..cm10.0 cm.The final image is a real image located10 0. cm to the left of the lens
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