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R वक्रता-त्रिज्या तथा `n_(1)` अपवर्तनांक का एक समतल-उत्तल लेन्स R वक्रता-त्रिज्या तथा `n_(2)` अपवर्तनांक के समतल-अवतल लेन्स के सम्पर्क में चित्रानुसार रखे जाते है | संयुक्त लेन्स की क्षमता है :
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`(1)/(f_(1)) = (n_(1)-1) ((1)/(R ))`
`(1)/(f_(2)) = (n_(2) -1) (-(1)/(R ))`
`therefore (1)/(f) = (1)(/(f_(1)) + (1)/(f_(2)) = (n_(!) -n_(2))/(R )`

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