Answer to Question #207975 in Optics for Tarik

Question #207975

The distance between an object and its real inverted imageis 20.0cm. If the magnification is 0.500, what is the focal length of the lens that is being used to form the image?

Expert's answer

"f= -\\frac{Md}{(1-M)^2}=-\\frac{0.5\\times20}{(1-0.5)^2}=-40 \\ cm."

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