Question

Among the constituents colors of white light, which color travels the slowest in glasses?

Answer 1

1. When light travels from one medium to another medium the frequency remains unchanged and hence, the speed of light depends upon the wavelength of light.
2. We know, $v=f\lambda$ where,$v$is the velocity of light, $f$is the frequency of light and $\lambda$ is the wavelength of light.
3. Therefore, the color with the shortest wavelength will travel the slowest.
4. Diagrammatic representation:

5. Violet light has the minimum wavelength among all the colours of white light (violet, indigo, blue, green, yellow, orange, and red).

6. Hence, among the constituents colors of white light, violet color travels the slowest in glasses.