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When is a person said to have developed ...

When is a person said to have developed cataract in his eye ? How is the vision of a person having cataract restored ?

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By cataract surgery.
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PRADEEP-THE HUMAN EYE AND COLOURFUL WORLD-(Additional)Very short answer
  1. Which defect of vision can be rectified using a convex lens ?

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  2. Which defect of vision can be rectified using a concave lens ?

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  3. When is a person said to have developed cataract in his eye ? How is t...

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  4. Which defect of the eye can be corrected using a cylindrical lens ?

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  5. Which colour has largest wavelength ?

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  6. Which colour suffers least deviation on passing through a prism ?

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  7. Name the phenomenon which causes the twinkling of stars.

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  8. Which phenomenon is responsiblefor increasing the apparent length of t...

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  9. Why do stars seem higher than they actually are ? Illustrate your answ...

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  10. What is persistence of vision ? Give one example of persistence of vi...

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  11. The sun looks reddish at the time of sunrise and sunset.

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  12. (a) Is eye lens made of glass ? (b) Is focal lengths of eye lens fix...

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  13. (a) What is aqueous homour ? (b) What is vitreous humour ?

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  14. (a) What is meant by far point of human eye ? (b) What is meant by n...

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  15. (a) For a normal eye, what is the least distance of distinct vision ? ...

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  16. (a) Which lens is used for correcting a mypoic eye ? (b) Which lens ...

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  17. Why are danger signals red in colour ?

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  18. Why does clear sky appear blue ?

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  19. Name the part of our eyes which helps us to focus near and distant obj...

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  20. To an astronaut is a spcaceship, the sky appears

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