An object is placed at a distance of 50 cm from a
concave lens. The image is formed at a distance of
20 cm from the lens. Find the focal length of the lens.
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An object is placed at a distance of 50 cm from a
concave lens. The image is formed at a distance of
20 cm from the lens. Find the focal length of the lens.
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Sale phir se panga mat lena