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  4. Monochromatic light is refracted from air into the glass of refractive index μ . The ratio of the wavelength of incident and refracted waves is:

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Q. Monochromatic light is refracted from air into the glass of refractive index $ \mu $ . The ratio of the wavelength of incident and refracted waves is:

JIPMERJIPMER 2000

Solution:

Since, from the formula $ \lambda =\frac{c}{v} $ hence, $ \frac{{{\lambda }_{a}}}{{{\lambda }_{g}}}=\frac{{{c}_{a}}}{{{c}_{g}}}=\mu =\mu :1. $