The plane faces of two identical plano convex lenses, each with focal length f are pressed against each other using an optical glue to form a usual convex lens. The distance from the optical centre at which an object must be placed to obtain the image same as the size of object is
A
B
C
f
D
2 f
Text Solution
Verified by ExpertsThe correct answer is:
C
Two plano-convex lens of focal length f , when combined will give rise to a convex lens of focal length 
.
The image will be of same size if object is placed at 2 f i.e. at a distance f from optical centre.
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