# If focal length of a convex lens is 50cm, power of lens will be how much?

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?

#### Explanation

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#### Explanation:

I want someone to double check my answer

54
Sep 25, 2015

$+ 2 D$.

#### Explanation:

To calculate the power of a lens, use the formula
Power= $\frac{1}{f}$
Where $f$ is the focal length which is measured in metres.

To answer your question, first we need to convert $50 c m$ to metres.
$50 c m = 0.5 m$

Power$= \frac{1}{0.5}$
Power$= + 2 D$
($D$ is the symbol for Diopter, the unit for power of lenses.)

Note that the answer must have a positive ($+$) sign as it is a convex lens. If you were to calculate the power of a concave lens, the answer would be in negative form.

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