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Why are the 'danger signal' lights red i...

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

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LAKHMIR SINGH & MANJIT KAUR-THE HUMAN EYE AND THE COLOURFUL WORLD -Exercise
  1. By how much time day would have been shorter if the earth had no atmos...

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

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

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

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

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

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  7. Why does the sun appear red at sunrise ?

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  8. Why does the sun appear red at sunset ?

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

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  10. The blue colour of sky is due to :

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

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

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

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

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

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

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

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  18. What is meant by the power of accommodation of the eye ?

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  19. What are the far point and near point of the human eye with no...

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  20. The least distance of distinct vision for a young adult with normal vi...

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