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The plane faces of two indentical plano-...

The plane faces of two indentical plano-convex lens, each having focal length of 80 cm, are placed 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

10 cm

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