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Question
Can the dispersive power \[\omega = \frac{\mu_u - \mu_r}{\mu - 1}\] be negative? What is the sign of ω if a hollow prism is immersed into water?
Solution
No, it cannot be negative, as the refractive index for violet light is always greater than that for red light. Also, refractive index is inversely proportional to \[\lambda^2.\] The sign of ω will be positive, as \[\mu\] is still greater than 1 and as \[\mu_v > \mu_r.\]
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