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3rd case because C1 is 40 and at if object placed at C1 then image formed on C2(right side) means image should formed at a distance of 40.
5th case beacuse f is 20 and C1 is 40 and object is between C1 and f then image formed beyond C2 means image distance must be greater then 40.
5th case beacuse f is 20 and C1 is 40 and object is between C1 and f then image formed beyond C2 means image distance must be greater then 40.
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