Explanation:

- The sky appears blue due to scattering of light.

- Scattering of light occurs when light rays are deflected in different directions. Shorter wavelengths, like blue, scatter more than longer wavelengths, giving the sky its blue color.

- Reflection of light involves light bouncing off surfaces. This does not primarily cause the sky’s color.

- Dispersion of light happens when light separates into its component colors, like in a prism. This process is different from scattering.

- Refraction of light is the bending of light as it passes from one medium to another. It’s not responsible for the blue sky.

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