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  4. The distance between a real object and its real image is 56 cm formed by converging lens, focal length of lens is

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Q. The distance between a real object and its real image is $56\, cm$ formed by converging lens, focal length of lens is

Ray Optics and Optical Instruments

Solution:

$f \leq \frac{D}{4}$
$f \leq \frac{56}{4}$
$f \leq 14 \,cm$