$f_v$ and $f_r$ are the focal lengths of a convex lens for violet and red lights respectively,and $F_v$ and $F_r$ are the magnitudes of the focal lengths of a concave lens for violet and red lights 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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