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Find the power of a concave lens of foca...

Find the power of a concave lens of focal length `2 m`.

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A concave lens has negative focal length, so it is to be written with a minus sign. Thus,
Focal length, f`=-2` m
Now, Power, `p=1/("f in metres")`
`P=1/-2`
`P=-0.5D`
Thus, the power of this concave lens is, `-0.5` dioptre.
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