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Why do stars twinkle?...

Why do stars twinkle?

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The refractive index of the earth.s atmospheres keeps varying in different regions. With increasing altitude, it goes on decreasing due to decreasing density of air. Hence, the starlight entering the earth.s atmospere undergoes continuous refraction is bent towards the normal before eaching our eyes. This causes changes in intensity of starlight entering our eyes. Thus, stars appear to be twinkling.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-QUESTIONS SECTION (TEXTUAL EXERCISE :)
  1. Make a diagram to show how hypermetropia is corrected. The near point ...

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  2. Why is a normal eye not able to see clearly the objects placed closer ...

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  3. What happens to the image distance in the eye when we increase the dis...

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  4. What causes twinkling of stars ?

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  5. Explain why the planets do not twinkle?

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  6. Why does the Sun appear reddish early in the morning ?

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  7. Why does the sky appear dark instead of blue to an astronaut ?

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  8. The human eye can focus objects at different distance by adjusting the...

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  9. The human eye forms the image of an object at this

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  10. Define the least distance of distinct vision. What is its value ?

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  11. The change in focal length of an eye lens is caused by the action of t...

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  12. A person needs a lens of power -5.5 dioptres for correcting his distan...

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  13. The far point of a myopic person is 80 cm in front of the eye. What is...

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  14. Make a diagram to show how hypermetropia is corrected. The near point ...

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  15. Why is a normal eye not able to see clearly the objects placed closer ...

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  16. What happens to the image distance in the eye when we increase the dis...

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  17. Why do stars twinkle?

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  18. Explain why the planets do not twinkle?

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  19. Why does the Sun appear reddish early in the morning ?

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  20. Why does the sky appear dark instead of blue to an astronaut ?

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