Question

the power of alens is -40 d it's fical length is?​

Answer 1

Answer:

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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Answer 2

Answer:

ur answer in attachment

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