An object 5 cm tall is 10 cm from a convace lens. The resulting image is one fifth as large as the object. What is the focal lenght of the lens?(adsbygoogle = window.adsbygoogle || []).push({});

I have been doing questions involving focal lenght, but not when the resulting image is a fraction of the original image. i do not know where to start or what equation(s) to use?? :(

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# Homework Help: Focal lenght of lens

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