1.

The distance between two point sources of light is 24cm .Where should a convergent lens witha focal length of f=9cm be placed between them to obtain the images of both sources at thesame point?

Answer»

Thus the lens should be placed either at 6 CM or at 18 cm between the two light sources.Explanation:GivenThe DISTANCE between the two light sources = 24 cmFocal length of the convergent lens F = 9 cmLet the lens is at u distance from the FIRST light sourceusingSimilarly for the second light sourceThus the lens should be placed either at 6 cm or at 18 cm between them.



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