# Calculate the power of lens, which has positive focal length of 20 cm

Calculate the power of lens, which has positive focal length of 20 cm
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tiltat9h
focal length,

Power of lens is given by
$p=\frac{1}{f}$
where f is in meters
$⇒p=\frac{1D}{+0.20}=+5D$
So power g given lens is +5D