Question

(i) Stars appear to twinkle because of
(a) Atmospheric refraction (b) Movement of air
(c) Both (a)and (b).
(d) None of these​

Answer 1

Answer:

c) both a) and b)

Explanation:

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Answer 2

Stars appear to twinkle because of option (c), Both (a) and (b).

Explanation:

• The twinkling of stars is caused by starlight being refracted by the atmosphere.
• Our eyes can see around six thousand  stars in the sky on a clear, dark night.
• They appear to twinkle or change brightness on a regular basis. In reality, the majority of the stars have a constant brightness.
• The movement of air in Earth's atmosphere causes starlight to bend slightly when it travels from a distant star through the atmosphere to us on the ground.
• As a result, some light reaches us straight while others are bent slightly away. This gives the impression that the star is twinkling to our sight.