what is the power of lens ? write SI unit of power of lens and write the equation showing relation between power of lens and focal length
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SI unit of power is Dioptre denoted by D.
Focal length of first lens f 1
=40 cm=0.4 m
Since the focal length is positive, so it is a convex lens.
Power of lens P 1 = f 1
1 = 0.41 =2.5 D
Focal length of second lens f 2
=−20 cm=−0.2 m
Since the focal length is negative, so it is a concave lens.
Power of lens P 2 = f 2
1 = −0.21 =−5 D
I hope it will help u...
Explanation:
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