Power of the lens is -40 it's focal length =?
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The power of a lens is a measure of its ability to produce deviation of light. A lens of short focal length produces more deviation of light than that of a lens of larger focal length. So, power of a lens is defined as the reciprocal of its focal length. The unit of power of lens is dioptre, D where f is in meter.
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Power of lens = -40
Power of the lens = reciprocal of focal length
-40 = 1/f
f = 1/-40 D
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