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Suggest how your irises help to protect ...

Suggest how your irises help to protect the retinas of your eyes from damage by bright light.

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LAKHMIR SINGH & MANJIT KAUR-THE HUMAN EYE AND THE COLOURFUL WORLD -Exercise
  1. The size of the pupil of the eye is adjusted by :

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  2. What shape are your eye-lenses : (a) when you look at your hand ? ...

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  3. Suggest how your irises help to protect the retinas of your eyes from ...

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  4. (a) Which parts of the eye cause rays of light to converge on the reti...

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  5. An object is moved closer to an eye. What changes must take place in t...

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  6. Why does the eye-lens not have to do all the work of converging incomi...

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  7. Name one of the common defects of vision and the type of lens used to ...

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  8. Name the defect of vision in a person : (a) whose near point is more...

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  9. Which defect of vision can be rectified : (a) by using a concave len...

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  10. What type of lens is used to correct (a) hypermetropia (b) myopia ?

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  11. What is the other name of (a) myopia (b) hypermetropia ?

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  12. What is the scientific name of (a) short-sightedness, and (b) long-sig...

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  13. What kind of lens is used to correct (a) short-sightedness (b) long-s...

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  14. State whether the following statement is true or false : Short-sight...

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  15. Name the defect of vision in which the eye-lens loses its power of acc...

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  16. Name the defect of vision which makes the eye-lens cloudly resulting i...

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  17. What is the other name of old age hypermetropia ?

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  18. Name any two defects of vision which can be corrected by using spectac...

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  19. Name one defect of vision (or eye) which cannot be corrected by any ty...

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  20. What is the far point of a person suffering from hypermetropia (or sho...

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