Q.

A star appears twinkling in the sky because of –

A. scattering of light by atmosphere
B. reflection of light by atmosphere
C. refraction of light by atmosphere
D. diffraction of light by atmosphere
Answer» C. refraction of light by atmosphere
Explanation: A star appears twinkling in the sky because of refraction of light, by atmosphere. Light bends when it passes obliquely from one medium to another. This is called refraction of light.
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