Twinkling of stars is due to atmospheric
a. Dispersion of light by different layers of varying refractive indices
b. Refraction of light by different layers of varying refractive indices
C. Scattering of light by dust particles
d. Internal reflection of light by clouds
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The atmospheric refraction occurs in a medium of gradually changing refractive index. The path of rays of light coming from the star goes on varying slightly. The apparent position of the star fluctuates and the star appears to twinkle.
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