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First find the focal length(if it is not given). Generally it is given to you
Convert the focal length into meter. Let it be f meter

Power = 1/f D
D is the unit of power of lens. It is called diopter
1 5 1
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glad to know that!! You are most welcome!!!
thanks bye
Dn = u-1/r1 + u-1/r2 , D = i/f
0 0 0
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