If fv and fR are the focal lengths of a convex lens for violet and red light respectively and Fv and FR are the focal lengths of concave lens for violet and red light respectively- then we have -a- fv FR -b- fv fR and Fv - FR -d- fv - fR and Fv - FR -here if we consider the fact that focal length of a concave lens is negative-we get option -a-0 but it is given anwer is -b- how -

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Lens Maker's Formula

If fv and fR ...

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If fv and fR are the focal lengths of a convex lens for violet and red light respectively and Fv and FR are the focal lengths of concave lens for violet and red light respectively, then we have (a) fv < fR and Fv > FR (b) fv < fR and Fv < FR (c) fv > fR and Fv > FR (d) fv > fR and Fv < FR (here if we consider the fact that focal length of a concave lens is negative,we get option (a)0 but it is given anwer is (b) how ?

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