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When two lenses are in combination.

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what logic is it to take the image of first lens (which is not formed in real) as a virtual object to the second lens ?

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  • $\begingroup$ What does "real" mean ? (rhetoric question) The light rays exist before and after what you're calling the "image". The "logic" is just a mean of calculus/drawing. $\endgroup$ – TZDZ Nov 24 '14 at 15:56

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