What is meant by the power of lens write its si unit a student uses a lems of focal lenght 40cm and -20cm write the Nature and power of lens
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The reciprocal of focal length of a lens in metres is known as power of lens.The S.I unit is dioptres(D).
You can solve or find power of lens by using formula:
P= 1/f(in metres)
You can solve or find power of lens by using formula:
P= 1/f(in metres)
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