What is the mean by the power of a lens .write the si unit . A student uses a lens of focal lenght 40cm and another of 20cm .write the nature and the power of each lens
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reciprocal of focal length is called power of lens
power of each lens is 0.4d and 0.2d
both are of convex lens
power of each lens is 0.4d and 0.2d
both are of convex lens
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