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Twinkling of stars is due to atmospheric...

Twinkling of stars is due to atmospheric

A

dispersion of light by water droplets

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

Text Solution

Verified by Experts

The correct Answer is:
B
The twinkling of a star is due to atmospheric refraction of lights of stars. These lights, on entering the earth's atmosphere, undergoes refraction continuously before it reaches the earth. The path of rays of light coming from the distant star goes on varying slightly, the apparent position of the star fluctuates and the amount of starlight entering the eye flickers. The star sometimes appears brighter and at some other time, fainter gives us the twinkling effect.
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Assertion :- The twinkling of stars is due to the fact that refractive index of the earth's atmosphere fluctuates. Reason :- In cold countries, the phenomenon of looming (i.e ship appears in the sky) takes place, because refractive index of air decreases with height.

NCERT EXEMPLAR-THE HUMAN EYE AND THE COLOURFUL WORLD -The Human Eye And The Colourful World
  1. At noon the sun appears white as

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  2. In the formation of a rainbow light from the sun on water droplets und...

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  3. Twinkling of stars is due to atmospheric

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  4. The clear sky appears blue, because

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  5. Which of the following statements is correct regarding the propagation...

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  6. The danger signals installed at the top of tall buildings are red in c...

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  7. Which of the following phenomena contributes significantly to the redd...

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  8. The blue colour of the water of the sea is due to :

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  9. When light rays enter the eye, most of the refraction occurs at the

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  10. The focal length of the eye lens increases when eye muscles

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  11. Draw ray diagrams each showing (i) myopic eye and (ii) hypermetrop...

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  12. A student sitting at the back of the classroom cannot read clearly the...

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  13. How are we able to see nearby and also the distant objects clearly?

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  14. Nooper needs a lens of power - 4.5 D for correction of her vision. (...

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  15. How will you use two indentical prisms so that a narrow beam of white ...

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  16. Draw a ray diagram showing the dispersion through a prism when a narro...

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  17. Is the position of a star as seen by us its true position? Justify you...

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  18. Why do we see a rainbow in the sky only after rainfall?

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  19. Why does clear sky appear blue ?

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  20. What is the difference in colours of the sun observed during sunrise/s...

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