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What is the nature of the lens right answer |
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Answer» please please MAKE me brainlist ok I'm urs don't be saf dearANSWERPower of lens is defined as the reciprocal of the focal length of the lens EXPRESSED in meter.SI UNIT of power is Dioptre denoted by D.Focal length of FIRST lens f 1 =40 cm=0.4 mSince the focal length is positive, so it is a convex lens.Power of lens P 1 = f 1 1 = 0.41 =2.5 DFocal length of SECOND lens f 2 =−20 cm=−0.2 mSince the focal length is negative, so it is a concave lens.Power of lens P 2 = f 2 1 = −0.21 =−5 D |
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