what is meant by power of a lens wrote it's SI unit a student uses a lens of focal length 40 cm and another of -20 cm wrote the nature and power of each lens
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sher42:
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What is meant by power of a lens?
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The power of a lens is the measure of the degree of convergence or divergence of light Ray's falling on it.
Write its SI Unit
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The SI unit is Dioptre (D)
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Have a look at the picture below :
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