if P1 and P2 powered lens combined together so the resultant power of the system is
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The focal length of the combination of two lenses placed in contact is given by the relation.
F1=f11+f21
If p1 is the power of lens of focal length f1, p2 the power of the focal length f2 and P the power of the combination of focal length, F then,
P=p1+p2
Thus the power of the combination of lenses is the algebraic sum of the powers of individual lenses.
If two lenses are separated by a distance d metre, then the power of the combination of lenses is given by a relation
P=p1+p2−d⋅(p1⋅p2)
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