A) \[{{\lambda }_{r}}\le {{\lambda }_{v}}\]
B) \[{{\mu }_{r}}>{{\mu }_{v}}\]
C) \[{{\mu }_{r}}<{{\mu }_{v}}\]
D) \[{{\lambda }_{r}}>{{\lambda }_{v}}\]
Correct Answer: C
Solution :
Key Idea: Red light bends the least in dispersion of white light by prism. The focal length of a lens, with refractive index \[(\mu )\] is given by \[\frac{1}{f}=(\mu -1)\,\left( \frac{1}{{{R}_{1}}-{{R}_{2}}} \right)\] where \[{{R}_{1}}\] and \[{{R}_{2}}\] are radii of curvatures of the first and second surfaces, respectively. \[\Rightarrow \] \[f\propto \frac{1}{\mu }\]. Since, \[{{f}_{v}}<{{f}_{r}}\]You need to login to perform this action.
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