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We know that light refracts (or bends) w...

We know that light refracts (or bends) when it goes from one medium to another. Now, the atmosphere contains only air. Then how does light get refracted on passing through only air in the atmosphere ?

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LAKHMIR SINGH & MANJIT KAUR-THE HUMAN EYE AND THE COLOURFUL WORLD -Exercise
  1. Due to atmospheric refraction of sunlight, the time from sunrise to su...

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  2. The day is longer on the earth by about 4 minutes because :

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  3. We know that light refracts (or bends) when it goes from one medium to...

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  4. By how much time day would have been shorter if the earth had no atmos...

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  5. Which of the two is scattered more easily : light of shorter wavelengt...

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  6. What colour does the sky appear to an astronaut ?

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  7. What happens when a beam of sunlight enters a dusty room through a win...

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  8. Why does the sky appear blue on a clear day ?

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  9. Why does the sky appear dark (or black) to an astronaut instead of blu...

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  10. Why does the sun appear red at sunrise ?

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  11. Why does the sun appear red at sunset ?

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  12. Why are the 'danger signal' lights red in colour ?

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  13. The blue colour of sky is due to :

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  14. The red colour of the sun at the time of sunrise and sunset is because...

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  15. Which of the following is not caused by the atmospheric refraction of ...

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  16. The sky appears blue because some of the blue component of sunlight is...

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  17. Sunset is red because at that time the light coming from the sun has t...

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  18. Explain why, when the sun is overhead at noon, it appears white, but w...

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  19. Complete the following statements : When the sun is setting, the lig...

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  20. Graphs plotted by four students A, B, C and D for the experiment "To s...

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