Question

Among the constituents colors of white light, which color travels the fastest 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 only.
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 longest wavelength will travel the fastest.
4. Diagrammatic representation:

5. Red light has the maximum wavelength among the constituent colors of white light (violet, indigo, blue, green, yellow, orange, and red).

6. Hence, among the constituents colors of white light, red color travels the fastest in glasses.