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Mention any four phenomena that can be o...

Mention any four phenomena that can be observed due to atmospheric refraction of light on the earth.

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(i) Twinkling of stars
(ii) Apparent change in the position of the sun/stars
(iii) Early sunrise and delayed sunset
(iv) Apparent flattening of the sun.s desc at the top and bottom during sunrise and sunset.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - SHORT ANSWER TYPE QUESTIONS - I
  1. A star sometimes brighter and at other times fainter. What is this eff...

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  2. Why do we see a rainbow in the ske only after rainfall ?

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  3. Mention any four phenomena that can be observed due to atmospheric ref...

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  4. What is the difference in colours of the sun observed during sunrise/s...

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  5. Sun appears red in colour during sunrise but appears white at noon. Ex...

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  6. Why does the sun seem to rise two minutes before the actual sunrise an...

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  7. The sun near the horizon appears flattened at sunset and sunrise. Expl...

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  8. Is the position of a star as seen by us its true position ? Justify yo...

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  9. "Stars appear higher than they actually are". Give reason.

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  10. Explain how the colour of the scattered light depends on the size of t...

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

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  12. What is meant by scattering of light ? Use this phenomenon to explain ...

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  13. Name the four parts labelled as 1,2,3 and 4 in the given figure.

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  14. In a human eye, name the following parts. (i) A thin membrane which ...

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  15. How are we able to see nearby and also the distant objects clearly ?

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  16. What is meant by accomodation of the eye ?

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  17. Name the parts of the eye which help in this phenomena and state how t...

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  18. Explain the changes taking place in the cilary muscles when we focus o...

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  19. How do the iris and pupil respond to (i) dim and (ii) bright light ?

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  20. Name the screen on which an image is formed in the eye. What is the ra...

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