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The plane faces of two identical planoconvex lenses each having focal length of 40 cm are pressed against each other to form a usual convex lens. The distance from this lens, at which an object must be placed to obtain a real, inverted image with magnification one is

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80 cm

40 cm

20 cm

162 cm

answer is B.

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Detailed Solution

To obtain, an inverted and equal size image, object must be placed at a distance of 2f from lens, i.e., 40 cm in this case.

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