POwer of lens is = 0.056D
given, f1 = 60cm
f2 = 25cm
using formula ,
1/F = 1/f1 + 1/f2
= 1/F = 1/60 + 1/25
= 0.016 + 0.04
1/F = 0.056
F = 17.85
Power of lens P= 1/f
= 1/17.85
= 0.056D
The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D). Converging (convex ) lenses have positive focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.
To learn more about power of lens from the given link
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