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Q.

The plane faces of two identical Plano convex lenses, each having focal length of 40cm ,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

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a

80 cm

b

40 cm

c

20 cm

d

160 cm

answer is B.

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Detailed Solution

f1=40 cm, f2=40 cm From 1F=1f1+1f2=140+140=120 F=20 cm. For real, inverted image with unit magnificationu=R=2F=40 cm.
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The plane faces of two identical Plano convex lenses, each having focal length of 40cm ,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