Physics, 31.03.2021 19:40 alisonguerrero17

A lens 20cm in front of an object produces a virtual image $\frac{2}{3}$
the size of the object. The lens focal length is?

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A lens 20cm in front of an object produces a virtual image
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A lens 20cm in front of an object produces a virtual image the size of the object. The lens focal length is?​

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A lens 20cm in front of an object produces a virtual image $\frac{2}{3}$
the size of the object. The lens focal length is?