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Suppose you wish to form an image of a 1cm wide object, 50cm away, on a sensor measuring 20mm. How can I calculate the magnification factor required and the focal length of the lens? I'm not sure how to begin.

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    Please don't phrase your question as a command. What have you tried? You will get better assistance if you give everyone an idea of where you are stuck.2012-08-29
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    sorry man, its just that i have no idea of how to do this question2012-08-29
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    That's totally fine. You're probably best off just saying that flat out. Even a wild guess will usually give everyone an idea of where you're at.2012-08-29

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