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Due to gradual weakening of ciliary musc...

Due to gradual weakening of ciliary muscles and diminishing flexibility of the eye lens, a certain defect of vision arises. Write the name of this defect. Name the type of lens required by such persons to improve the vision. Explain the structure and function of such a lens.

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The name of this defect is Myopia or short sightedness. For details,.
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PRADEEP-THE HUMAN EYE AND COLOURFUL WORLD-(Additional)Short answer
  1. What is the nature of eye lens ? Is its focal length fixed ?

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  2. What is meant by accommodation of the eye ?

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  3. Due to gradual weakening of ciliary muscles and diminishing flexibilit...

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  4. What is range of vision ?

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

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  6. Why cannot we read a printed page by holding it very close to our eyes...

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  7. Draw a simple sketch of human eye and label any five important constit...

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  8. Image of an object at infinity is formed in front of retina of an eye,...

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  9. Image of an object held at near point N is formed at the back of retin...

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  10. Draw the course of rays for correcting a myopic eye.

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  11. Draw the course of rays for correcting a hypermetropic eye.

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  12. Why has nature given us two eyes instead of one ?

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  13. We can see a rainbow on a suuny day by looking at the sky through a wa...

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  14. (a) Name the factors on which deviation of a ray of light through a pr...

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  15. (a) What is the order of longest visible wavelength ? Which colour has...

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  16. (a) What is the frequency of violet colourof wavelength 4000 A^@ ? (...

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  17. (a) Why do spectrum colours recombine on passing through two prisms or...

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  18. (a) Which phenomenon accounts for advanced sunrise and delayed sunset ...

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  19. (a) What is the essential condition for Rayleigh scattering ? (b) In...

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  20. How is the amount of light entering the eye controlled ?

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