Multiple choice

The clear sky looks blue because of

  1. reflection of light

  2. refraction of light

  3. deffraction of light

  4. dispersion of light

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The sky appears blue because of Rayleigh scattering, which is a form of light scattering where shorter wavelengths (blue) are scattered more strongly by atmospheric particles than longer wavelengths (red). While often categorized under scattering, it is frequently grouped with dispersion in general science contexts.