2 lens are of power 12 and -2 diopter.find the focal length of their combination
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here we use equivalent of power
P =P1 +P2
=12+(-2)=10 D
we also know ,
P=1/f
so,
f=1/p=1/10=0.1m =10 cm
P =P1 +P2
=12+(-2)=10 D
we also know ,
P=1/f
so,
f=1/p=1/10=0.1m =10 cm
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