Find the focal length of a convex lens, if its power is +2.0 D.

0.5 m

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-0.5 m

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1 m

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-1 m

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Solution

The correct option is A 0.5 m
Power of lens P = $\frac{1}{f}$
$∴ f = \frac{1}{P} = \frac{1}{+ 2} = 0.5 m$

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Find the focal length of a convex lens, if its power is +2.0 D.

The correct option is A 0.5 mPower of lens P = 1f ∴f=1P=1+2=0.5m

The correct option is A 0.5 m
Power of lens P = $\frac{1}{f}$
$∴ f = \frac{1}{P} = \frac{1}{+ 2} = 0.5 m$