The refractive index of a prism is measured using three lines of a mercury vapour lamp. If $\mu_1, \mu_2$ and $\mu_3$ are the measured refractive indices for these green,blue and yellow lines respectively,then
- A$\mu_2 > \mu_3 > \mu_1$
- B$\mu_2 > \mu_1 > \mu_3$
- C$\mu_3 > \mu_2 > \mu_1$
- D$\mu_1 > \mu_2 > \mu_3$
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