Question : A star appears twinkling in the sky because of :
Option 1: scattering of light by atmosphere
Option 2: reflection of light by atmosphere
Option 3: refraction of light by atmosphere
Option 4: diffraction of light by atmosphere
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Correct Answer: refraction of light by atmosphere
Solution : The correct answer is refraction of light by atmosphere.
Stars appear twinkling in the sky because of refraction of light rays by various layer of atmosphere. Stars are millions of light years away from the earth and they emit their own light rays. These light rays when reach earth, they pass through various layers of atmosphere which has different temperature, density and composition. Because of this these incoming light rays get refracted and create a twinkling effect. Refraction is the shift in the path of light ray when it travels from a rarer medium to a denser medium.
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