If f(V) and f(R) are the focal lengths o...

If `f(V)` and `f_(R)` are the focal lengths of a concex lens for violet and red light respectively and `F_(V)`and `F_(R)` are the focal lengths of concave lens for violet and red light respectively, then we have

`f_(V)gtf_(R)andF_(V)gtF_(R)`

`f_(V)ltf_(R)andF_(V)gtF_(R)`

`f_(V)gtf_(R)andF_(V)ltF_(R)`

`f_(V)ltf_(R)andF_(V)ltF_(R)`

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