$f_V$ and $f_R$ are the focal lengths of a convex lens for violet and red light respectively,and $F_V$ 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$f_V < f_R$ and $F_V > F_R$
- C$f_V > f_R$ and $F_V > F_R$
- D$f_V > f_R$ and $F_V < F_R$
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