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The principal axis of a thin equi-convex lens is the x-axis. The co-ordinate of a point object and its image are `(– 20 cm, 1 mm)` and `(25 cm, 2 mm)`

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The principal axis of a thin equi-convex lens is the x-axis. The co-ordinate of a point object and its image are `(– 20 cm, 1 mm)` and `(25 cm, 2 mm)` respectively. Find the focal length of the lens.
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Correct Answer - 90 cm
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