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Let \( f_{v} \) and \( f_{r} \) are the focal lengths of a convex lens for violet and red lights respectively. If \( F_{v} \) and \( F_{r} \) are the focal lengths of a concave lens for violet and red light respectively, then
(A) \( f_{v}f_{r} \) and \( F_{v}F_{r} \)
(B) \( f_{c}f_{r} \) and \( F_{v}F_{r} \)
(C) \( f_{\nu}f_{r} \) and \( F_{\nu}F_{r} \)
(D) \( f_{v}f_{r} \) and \( F_{v}F_{r} \)
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