Question

Assertion(A):The wavering of light in an effect of atmospheric refraction. Reason(R):The atmospheric refraction of light occurs in a medium of gradually changing refractive index.
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Answer 1

Answer:

Assertion

• This wavering is thus an effect of atmospheric refraction.

Reason

• The atmospheric refraction occurs in a medium of gradually changing refractive index. Since the atmosphere bends starlight towards the normal, the apparent position of the star is slightly different from its actual position. Since the stars are very distant, they approximate point-sized sources of light.

Explanation:

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