368 Image FormationP36.54(a)The lensmaker’s equation111pqf+=givesqfppffpfppf=−=−=−1111bg.Then,Mhhqpfpf=′= −= −−gives′ =−hhffp.(b)For pf>>, fpp−≈ −. Then,′ =−hhfp.(c)Suppose the telescope observes the space station at the zenith:′ = −= −×=−hhfp108 64 00407101 073...mmmmmafaf.P36.55(b)Call the focal length of the objective foand that of the eyepiece −fe. The distance betweenthe lenses is ffoe−. The objective forms a real diminished inverted image of a very distantobject at qfo1=. This image is a virtual object for the eyepiece at pfe2= −.For it111pqf+=becomes111−+
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