what is meant by power of a lens ? write its SI unit . A student uses a lens of focal length 40 cm and another of -20 cm . write the nature and power of each lens .

what is meant by power of a lens ? write its SI unit . A student uses

1.	what is meant by power of a lens ? write its SI unit . A student uses a lens of focal length 40 cm and another of -20 cm . write the nature and power of each lens .
Answer» POWER = RECIPROCAL of the focal length [in meters] SI unit is D (Dioptre) ANS ) a) we have f=40cm=0.4m p=1/0.4=5/2=+2.5D CONVEX lens b) f= -20cm=0.2m p= 1/0.2= -5D concave lens

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what is meant by power of a lens ? write its SI unit . A student uses a lens of focal length 40 cm and another of -20 cm . write the nature and power of each lens .

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