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The plano-convex lenses of focal length $40$ cm are placed with their plane surfaces in contact to form an ordinary convex lens. The distance of an object from this lens in order to obtain its real, inverted image of unit magnification will be :
$20 c m$
$80 c m$
$40 c m$
$160 c m$

A

80 c m

B

160 c m

C

40 c m

D

20 c m

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