A point object \(O\) is placed at a distance \(2 f\) from a thin convex lens of focal length \(f....

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A point object \(O\) is placed at a distance \(2 f\) from a thin convex lens of focal length \(f\) as shown in figure. The lens starts rotating about an axis perpendicular to the plane of paper, (object remains fixed and \(O A\) remains in the same plane), the speed of image when object is rotated by \(2^{\circ}\) is:
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