Power of a lens is $+ 2.0 D$ then it's focal length is

0.05 M

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0.5 M

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0.005 M

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0.0005 M

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Solution

The correct option is B $0.5 M$
$f = \frac{1}{B} = \frac{1}{2} = 0.5 m$
Ans. (B)
In all option should be $m$ is compound $m$ .

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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

Find the focal length of a lens of power −2.0 D. What type of lens is this?

+ 2.0 D

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