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  4. At what distance from a biconvex lens of the focal length F, must be placed an object for the distance between the object and its real image to be minimal?

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Q. At what distance from a biconvex lens of the focal length $F$, must be placed an object for the distance between the object and its real image to be minimal?

TS EAMCET 2018

Solution:

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Minimum distance of an object and its real image is $4 F$. For this, object must be placed at distance $2 F$ from lens.