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v f and r f are the focal lengths of a convex lens for violet and red light respectively and v F and r F are the focal lengths of a concave lens for violet and red light respectively, then

1. r v f f  and r v F F 
2. R v f f  and r v F F 
3. r c f f  and r v F F 
4. r v f f  and r v F F 

Correct answer: R v f f  and r v F F 

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