Modelová Otázka ID 3604 - 
Které z následujících tvrzení platí pro optickou mohutnost čočky?
Správná odpověď je: D
Optická mohutnost čočky φ vyjadřuje její zakřivení a schopnost lomit světelné paprsky. Lze ji určit jako převrácenou hodnotu ohniskové vzdálenosti čočky, tedy 
, a pro její jednotku platí:
[φ] = 1/m = m–1 = D (dioptrie).
Při kladné ohniskové vzdálenosti čočky je její optická mohutnost kladná, je‑li ohnisková vzdálenost čočky záporná, je záporná i její optická mohutnost.
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