Two point sources 
and 
are 
apart. Where should a convex lens of focal length 
be placed in between them, so that the images of both sources are formed at the same place?
Text Solution
Verified by ExpertsB
The given condition will be satisfied only if one source 
) placed on one side such that 
(i.e., it lies under the focus. The other source 
is placed on the other side of the lens such that 
(i.e., it lies beyond the focus).
If 
is the object for the lens, then
…… ..(i)
If 
is the object for the lens, then
Adding (i) & (ii), we get
and 
So, the correct answer will be 
.
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