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| Q. |
The colour of sky appears blue due to – |
| A. | reflection |
| B. | refraction |
| C. | scattering of shorter wave lengths |
| D. | dispersion |
| Answer» C. scattering of shorter wave lengths | |
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Explanation: The sunlit sky is blue because air scatters short-wavelength light more than longer wavelengths. Since blue light is at the short wavelength end of the visible spectrum, it is more strongly scattered in the atmosphere than long wavelength red light. The result is that the human eye perceives blue when looking toward parts of the sky other than the sun. |
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