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Introductory Physics Homework Help
Calculate the focal distance of the duplicate
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[QUOTE="kuruman, post: 6306097, member: 192687"] What did you use for the focal length of the second lens? Note that the figure shows a clear air gap between the two lenses. This means that you should find the two focal lengths as if the lenses were surrounded by air. [B]On edit[/B]: You need to adopt the standard strategy for solving compound lens problems of this kind: (a) Put an object at some finite distance ##s## in front of the combination; (b) find the position of the image ##s'##; (c) Treat the image as the object for the second lens (pay close attention to what is real and what is virtual); (d) find the position of the final image ##s''##; (e) let ##s## go to infinity and see what ##s''## becomes; (f) relate ##s''## to the focal length of the combination. I tried this method for this problem and got the answer you quoted as correct. [/QUOTE]
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Introductory Physics Homework Help
Calculate the focal distance of the duplicate
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