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List two main causes of a person develop...

List two main causes of a person developing near-sightedness. Show with the help of a ray diagram how this defect can be corrected.

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Student is having myopia which is caused by (i) excessive curvature of the eye lens or (i) elongation of eyeball resulting in focusing of image in front of retina. Thus, the distant images are blurry but the nearby images are clear.
myopia can be corrected by using a concave lens of suitable power which diverges the light rays and makes the image formed on the retina as shown.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - SHORT ANSWER TYPE QUESTIONS - II
  1. Draw ray diagrams showing (i) myopia eye and (ii) hypermetropia eye.

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  2. A person cannot see objects further than 10 metres from the eye clearl...

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  3. List two main causes of a person developing near-sightedness. Show wit...

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  4. Study the diagram and answer the questions the follow it : (i) Which...

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  5. A narrow beam PQ of white light is passing through a glass prism ABC a...

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  6. When light passes through a prism, seven colours namely VIBGYOR are se...

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  7. What is disperson of white light ? State its cause. Draw a ray diagr...

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  8. Describe an activity to show refraction of light through a prism. Draw...

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  9. Draw a ray diagram to show the path of light that enters the glass pri...

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  10. Describe the formation of a rainbow in the sky with the help of a diag...

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  11. Why do different colours get separated when a white light passes throu...

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  12. Explain the experiment conducted by Newton to show that white light co...

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  13. With the help of a labelled diagram. Explain why the sun appears reddi...

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  14. Draw a labelled diagram of the human eye. What is the significance of ...

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  15. Draw ray diagrams showing (i) myopia eye and (ii) hypermetropia eye.

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  16. A person cannot see objects further than 10 metres from the eye clearl...

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  17. List two main causes of a person developing near-sightedness. Show wit...

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  18. Study the diagram and answer the questions the follow it : (i) Which...

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  19. A narrow beam PQ of white light is passing through a glass prism ABC a...

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  20. When light passes through a prism, seven colours namely VIBGYOR are se...

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    |