Answer to Question #133459 in Optics for Kumar

Question

The ratio of the refractive index of red light to blue light in glass is

Answer 1

According to Cauchy's equation, refractive index of a material is

$$n=a+\frac{b}{\lambda^2}$$

Hence, as the colour changes, the wavelength changes and the value of refractive index changes.

$$\frac{n_R}{n_B}<1$$