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1027_Physics ProblemsTechnical Physics

1027_Physics ProblemsTechnical Physics - 368 Image...

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368 Image Formation P36.54 (a) The lensmaker’s equation 1 1 1 p q f + = gives q f p p f fp fp p f = = = 1 1 1 1 b g . Then, M h h q p f p f = = − = − gives ′ = h hf f p . (b) For p f >> , f p p ≈ − . Then, ′ = h hf p . (c) Suppose the telescope observes the space station at the zenith: ′ = − = − × = h hf p 108 6 4 00 407 10 1 07 3 . . . m m m mm a fa f . P36.55 (b) Call the focal length of the objective f o and that of the eyepiece f e . The distance between the lenses is f f o e . The objective forms a real diminished inverted image of a very distant object at q f o 1 = . This image is a virtual object for the eyepiece at p f e 2 = − . For it 1 1 1 p q f + = becomes 1 1 1 +
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