Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is
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Two concave lenses of 60 cm focal length are cemented on either side of a convex lens ... The focal length of the combination is .... Two concave lens = 60cm and convex lens = 15cm...........................
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The correct answer is 30 cm.
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