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Power of a Lens

The power of ...

Question

The power of a lens is -2.0 D. Find its focal length and its kind.

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Solution

F=1/P
=1/-2
=-0.5 m or -50 cm
power is negative so it is a concave lens

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Q. The power of a lens is +2.0D. Its focal length should be :
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Q. Focal length of a lens of power -2.0 D is ___ m.

A converging lens has a focal length of 50 cm. The power of this lens is : (a) + 0.2 D (b) - 2.0 D (c) + 2.0 D (d) - 0.2 D

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