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  4. A far sighted person can see object beyond 49 cm clearly. If separation between glasses and eye lens is 1 cm, then find focal length of glass :-

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Q. A far sighted person can see object beyond $49\, cm$ clearly. If separation between glasses and eye lens is $1\, cm$, then find focal length of glass :-

Ray Optics and Optical Instruments

Solution:

image
$\frac{1}{f}=\frac{1}{v}-\frac{1}{u}=\frac{1}{-48}-\frac{1}{-24}$
$f=48\, cm$