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An object is kept at 20 cm in front of a...

An object is kept at 20 cm in front of a convex lens and its real image is formed at 60 cm from the lens. Find (1) the focal length of the lens (2) the image if the height of the object is 6 cm.

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(1) 15 cm (2) `h_(2) = - 18 ` cm
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