( Ill) Given two 12-cm-focal-length lenses, you attempt

Chapter , Problem 80

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( Ill) Given two 12-cm-focal-length lenses, you attempt tomake a crude microscope using them. While holding theselenses a distance 55 cm apart, you position your microscopeso that its objective lens is distance dQ from a small object.Assume your eyes near point N = 25 cm. (a) For yourmicroscope to function properly, what should d0 be?(b) Assuming your eye is relaxed when using it, what magnificationM does your microscope achieve? (c) Since thelength of your microscope is not much greater than thefocal lengths of its lenses, the approximation M ~ N /fef0is not valid. If you apply this approximation to yourmicroscope, what % error do you make in your microscopestrue magnification?

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