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  4. Assertion Refractive index of glass with respect to air is different for red light and violet light. Reason Refractive index of a pair of media depends on the wavelength of light used.

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Q. Assertion Refractive index of glass with respect to air is different for red light and violet light.
Reason Refractive index of a pair of media depends on the wavelength of light used.

Ray Optics and Optical Instruments

Solution:

Refractive index of any pair of media is inversely proportional to wavelength of light.
Hence, $\lambda_{v}<\lambda_{r}$
$\Rightarrow \mu_{v}>\mu_{r}$
where, $\lambda_{v}$ and $\lambda_{r}$ are the wavelengths of violet and red light and $\mu_{r}$ and $\mu_{v}$ are refractive index of violet and red light.