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When you enter a cinema hall, you are un...

When you enter a cinema hall, you are unable to see the persons sitting nearby, but after a while you can see tham. Explain.

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MODERN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-EXERCISE
  1. Fill ups Blue colour of the sky is due to the …………………of light.

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  2. Fill ups The frequency of…………….colour of light is maximum and………….is m...

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  3. When you enter a cinema hall, you are unable to see the persons sittin...

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  4. After watching a shown of 12-3 pm when you come out of the cinema hall...

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  5. The major convergence of rays reaching the eyes is done by

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  6. Myopia is corrected by

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  7. Hypermetropia is corrected by

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  8. The intensity of light entering the eye is controlled by

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  9. A prism splits a beam of white ligth into its seven constituent colour...

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  10. Twinkling of stars is due to atmospheric:

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  11. Ciliary muslces can change the focal length of eye lens. This phenomen...

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  12. True or False : A sensory nerve conducts nerve impulses from brain to...

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  13. A student has difficulty in reading the blackboard while sitting in th...

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  14. Write in one word or at most one sentence about the following Mirrors ...

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  15. Write in one word or at most one sentence about the following The smal...

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  16. The far point of a myopic person is 80 cm. In front of the eye. What i...

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  17. Why are dnger signals red in colour?Give reason.

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  18. Mention the type of mirrors used as rear view mirrors. List reasons to...

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  19. What is meant by power of accomodation of the eye?

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  20. State the symptom cause and the nature of the lens used to correct the...

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