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How are we able to see nearby and also t...

How are we able to see nearby and also the distant objects clearly ?

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The human eye has the ability to adjust its focal length according to the distance of object, which is known as power of accomodation. While viewing distant objects, ciliary muscles of the eye relax which makes the eye les thinner. This increases the focal length of the eye lens so that a clear image of the object is formed on the retina. While viewing nearby objects, ciliary muscles contract which increases the curvature of the eye lens. This decreses the focal length of the eye lens so that a clear image of the object is formed on the retina.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - SHORT ANSWER TYPE QUESTIONS - I
  1. Name the four parts labelled as 1,2,3 and 4 in the given figure.

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  2. In a human eye, name the following parts. (i) A thin membrane which ...

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  3. How are we able to see nearby and also the distant objects clearly ?

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  4. What is meant by accomodation of the eye ?

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  5. Name the parts of the eye which help in this phenomena and state how t...

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  6. Explain the changes taking place in the cilary muscles when we focus o...

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  7. How do the iris and pupil respond to (i) dim and (ii) bright light ?

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  8. Name the screen on which an image is formed in the eye. What is the ra...

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  9. How can change of size of eyeball be one of the reason for (i) myopia ...

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  10. Explain giving reason the type of lens used to correct the defect of v...

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  11. Name the part of eye where the image is formed in a nornaml human eye....

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  12. What is hypermetropia or far-sightedness ? Name the type of lens used ...

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  13. What is presbyopia ? Write two causes of this defect.

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  14. What are bifocal lenses ? Who needs to use them ?

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  15. A person is able to see objects clearly only when these are lying at a...

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  16. What is dispersion ? What happens when light is passed through a glass...

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  17. A beam of white light falling a glass prism split up into seven colour...

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  18. List the three phenomena of light responsible for the formation of rai...

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  19. A beam of light consisting of red, blue, and yellow colours is inciden...

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  20. When a beam of white light is passed through a triangular glass prism,...

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