A convex lens produces an image of a candle flame upon a screen who...

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A convex lens produces an image of a candle flame upon a screen whose distance from candle is \( D \). When the lens is displaced through a distance \( \mathrm{x} \), (the distance between the candle and the screen is kept constant), it is found that a sharp image is again produced upon the screen. Find the focal length of the lens in terms of \( D \) and \( x \).
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