The distance between an object and its upright image is d. If the magnification is M, what is the focal length of the lens being used to form the image? (Use any variable or symbol stated above as necessary.) If M > 1, f = ?
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An object of height $h$ is placed at a distance $d_{\mathrm{a}}$ on the left side of a converging lens of focal length $f\left(f<d_{\mathrm{o}}\right)$ a) What must $d_{\mathrm{o}}$ be in order for the image to form at a distance $3 \mathrm{f}$ on the right side of the lens? b) What will be the magnification?
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