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  4. In displacement method we use a lens of focal length f and distance between object and screen is 60 cm. Possible value for focal length is

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Q. In displacement method we use a lens of focal length $f$ and distance between object and screen is $60 \,cm$. Possible value for focal length is

Ray Optics and Optical Instruments

Solution:

$f \leq \frac{D}{4}$
$f \leq \frac{60}{4}$
$f \leq 15 \,cm$