Doctor advised a 2d lens for a person for good vision what is its focal length in cm
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given,
power -2 d
>power =1/f
>2=1/f
>2f =1
>f=1/2
>f=0.5m
>f=0.005cm.
maybe it's right...
power -2 d
>power =1/f
>2=1/f
>2f =1
>f=1/2
>f=0.5m
>f=0.005cm.
maybe it's right...
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