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MHT CET Physics question

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A thin concave lens is in contact with a thin convex lens. The ratio of the magnitude of the reciprocal of focal length of concave lens and that of convex lens is . The focal length of the combined lens is 30 cm. Focal length of the concave lens is [MHT-CET 2023]

Answer: (A)

Solution

Let the convex power be ; the concave power is then , so , giving

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Question ID VK-069439