Questions
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
detailed solution
Correct option is B
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.Talk to our academic expert!
Similar Questions
Two thin lenses of focal lengths f1 and f2 are in contact. The focal length of this combination is
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