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What is the cause of random wavering or ...

What is the cause of random wavering or flickering of the objects near a fire or on a very hot day ?

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Air above the fire is hot. The hotter air is less denser than the colder air. This difference in density leads to difference in refractive indices and causes refraction. This results in changes in the apparent image of the object.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - VERY SHORT ANSWER TYPE QUESTIONS
  1. On what factor does the colour of the scattered light depend ?

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

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

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

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

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

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  7. What is cornea ?

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  8. Mention the function of eye lens.

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

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

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

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

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

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  14. What is iris?

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  15. Which part of the eye generates electric signals ?

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  16. What is blind spot ?

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

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  18. Which muscles help in changing the shape of the eye lens ?

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  19. State one point of similarity between the image formed by the human ey...

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  20. Why are we not able to see the things clearly when we come out of a dr...

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