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What is iris?...

What is iris?

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Iris is a dark muscular diaphragm present behind the cornes of the human eye that controls the size of the pupil.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - VERY SHORT ANSWER TYPE QUESTIONS
  1. Which nerves carry electrical signals from the light-sensitive cells o...

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  2. Which are the light-sensitive cells present in the retina of the human...

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  3. What is iris?

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  4. Which part of the eye generates electric signals ?

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  5. What is blind spot ?

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  6. What is the function of pupil of the human eye ?

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  7. Which muscles help in changing the shape of the eye lens ?

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  8. State one point of similarity between the image formed by the human ey...

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  9. Why are we not able to see the things clearly when we come out of a dr...

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  10. why does it take some time to see objects in a cinema hall when we jus...

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  11. Define the least distance of distinct vision. What is its value ?

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  12. How is cataract caused ? How is it cured ?

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  13. Mention one advantage of having two eyes instead of one.

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  14. How do the eyes of a tiger difer from that of a rabbit ?

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  15. What is the main advantage of having two eyes in front of the head ?

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  16. A person can see nearby objects clearly but distant objects appear blu...

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  17. In which defect of vision is (i) the far point nearer than infinity ? ...

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  18. A person can see distant objects clearly but nearby objects appear blu...

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  19. Which vision defect arises when the eyeball (i) shrinks and (ii) elong...

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  20. Which eye defect can be corrected using (i) convex lens and (ii) conca...

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