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To an observer on the earth the stars ap...

To an observer on the earth the stars appear to twinkle. This can be ascribed to

A

The fact that stars do not emit light continuously

B

Frequent absorption of star light by their own atmosphere

C

Frequent absorption of star light by the earth's atmosphere

D

The refractive index fluctuations in the earth's atmosphere

Text Solution

Verified by Experts

The correct Answer is:
D
It is due to multiple refraction and refractive index fluctuation in the earth’s atmosphere.
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(a) Give reasons for the following: (i) The sky appears to be blue during day time to a person on earth. (ii) The sky near the horizon appears to have a reddish hue at the time of sunset and sunrise. (iii) The sky appears dark instead of blue to an astronaut. (iv) The stars appear to twinkle. (v) The planets do not twinkle.

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ERRORLESS-RAY OPTICS-NCERT BASED QUESTIONS (Refraction of Light at Plane Surfaces)
  1. To an observer on the earth the stars appear to twinkle. This can be a...

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  2. When light travels from one medium to the other of which the refractiv...

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  3. Ray optics is valid, when characteristic dimensions are

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  4. The refractive index of a certain glass is 1.5 for light whose wavelen...

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  5. A light wave has a frequency of 4xx10^(14)Hz and a wavelength of 5xx10...

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  6. A beam of light propagating in medium A with index of refraction n ( A...

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  7. When a light wave goes from air into water, the quality that remains ...

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  8. The refractive indices of glass and water are 3/2 and 4/3 respectively...

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  9. Refractive index of glass is (3)/(2) and refractive index of water is ...

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  10. Monochromatic light of wvalength 589 nm is incident from air on a wate...

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  11. Light waves travel from optically rarer medium to optically deser med...

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  12. Which of the following graphs shows appropriate variation of refractiv...

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  13. A monochromatic beam of light is travelling from medium A of refractiv...

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  14. If epsi(0) and mu(0) are respectively, the electric permittivity and t...

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  15. The refractive index and the permiability of a medium are respectively...

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  16. A ray of light is travelling from glass to air. ("Refractive index of ...

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  17. On a glass plate, a light wave is incident at an angle of 60^(@). If t...

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  18. A material is embedded between two glass plates. Refractive index n o...

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  19. The angles of incidence and refraction of a monochromatic ray of light...

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  20. A vessel of depth 2d cm is half filled with a liquid of refractive ind...

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