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12. A convex lens of focal length 30 cm produces a real image 3 times magnified. Find the object distance.​

Answer»

Given:F = 20 cmm = -3 = v/uv = -3uLens formula: 1/v - 1/u = 1/f                         1/(-3u) - 1/u = 1/20        - 4/(3u) = 1/20            3u = - 4 x 20               u = -80/3 = - 26.6 cmThe object is at a distance of 26.6 cm to the left from the optic CENTRE of the lens.Explanation:



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