A beam of light converges to a point on a screen. If a lens is placed in the path of the beam at...

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A beam of light converges to a point on a screen. If a lens is placed in the path of the beam at \( 10 \mathrm{~cm} \) away from the screen, the screen has to be moved through \( 8 \mathrm{~cm} \) to obtain a sharp image.
Find the focal length of the lens
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