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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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
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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