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The plane faces of two identical planoco...

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

A

80 cm

B

40 cm

C

20 cm

D

162 cm

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The correct Answer is:
b
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