Question

Which of the following is a correct statement? (1 point)

1. Dispersion of light occures because different
   colors of light have different refractive
   indexes.
2. All colors of light have the same refractive
   index in a given medium.
3. Dispersion is selective transmission of light.
4. The seven different colors of light listed in
   decreasing order of wavelength are violet,
   indigo, blue, green, yellow, orange and red.
5. As wavelength of light increases, refractive
   index increases.

Answer 1

Only statement (A) is correct. The dispersion of light occurs because different colors of light have different refractive index. And angle of dispersion depends on the refractive index of the light which is consist of seven different colors of in increasing order of wavelength (VIBGYOR) . Red have greatest wavelength so least refractive index and also least angle of dispersion. On the other hand voilet has smallest wavelength and greatest refractive index so it's angle of dispersion is also greater.