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# Refractive index for a piece of transparent material is greatest for

(a) red light

(b) violet light

(c) green light

(d) yellow light

For the visible range wavelength for red light is greater and violet light is least
we have $\mu \alpha \large\frac{1}{\lambda}$
$\lambda _r > \lambda_v$
$\therefore \mu_v > \mu _r$
Hence b is the correct answer.

edited Jul 14, 2014