what is meant by power of lens what it's si unit a student use focal length 40 and another of 20 write

what is meant by power of lens what it's si unit a student use focal l

1.	what is meant by power of lens what it's si unit a student use focal length 40 and another of 20 write
Answer» The RECIPROCAL of the focal length is known as power of lens. it's s.i UNIT is diopter. if a student use focal length 40M then power=1/f P= 1/16= 0.006D if focal length=20m P=1/20 = 0.5

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what is meant by power of lens what it's si unit a student use focal length 40 and another of 20 write

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