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What is the reason for atmospheric refra...

What is the reason for atmospheric refraction ?

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Varying temperatures in different regions of the atmosphere cause changes in density and hence refractive indices. This causes refraction of light travelling through the atmosphere.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - VERY SHORT ANSWER TYPE QUESTIONS
  1. Why does disperson occur only on refraction and not on reflection ?

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  2. How does the sky appear from the surface of the moon ?

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  3. What is the reason for atmospheric refraction ?

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  4. On what factor does the colour of the scattered light depend ?

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  5. How does atmospheric refraction affect the duration of the day on the ...

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  6. What is the cause of random wavering or flickering of the objects near...

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  7. Name any two phenomena which arise due to scattering of light in the e...

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  8. What would have been the colour of the sky, in the absence of atmosphe...

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  9. Why are the traffic light-signals [or danger signals] of red colour ?

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  10. What is cornea ?

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  11. Mention the function of eye lens.

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  12. Where does refraction of light rays occur in the human eye ?

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  13. Mention the role of iris in the human eye.

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  14. Which are the light-sensitive cells present in the retina of the human...

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  15. Which nerves carry electrical signals from the light-sensitive cells o...

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  16. Which are the light-sensitive cells present in the retina of the human...

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  17. What is iris?

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  18. Which part of the eye generates electric signals ?

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  19. What is blind spot ?

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  20. What is the function of pupil of the human eye ?

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