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Why does the sky appear dark instead of ...

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

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The atmosphere is quite this at very high altitudes. There is almost no scattering of sunlight. So the sky appears dark to an astronaut.
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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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