Two point light sources are 24 cm apart. Where should a convex lens of focal length 9 cm be put in between them from one source so that the images of both the sources are formed at the same place
Text Solution
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The given condition will be satisfied only if one source (S 1 ) placed on one side such that u < f (i.e. it lies under the focus). The other source (S 2 ) is placed on the other side of the lens such that u > f (i.e. it lies beyond the focus).
If 
is the object for lens then 
........(i)
If 
is the object for lens then 
........(ii)
From equation (i) and (ii)
On solving the equation 
, 6 cm
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