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What are rods and cones ?...

What are rods and cones ?

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Sensitive portion of retina has large number of cells, rod shaped and cone shaped cells. Rod shaped cells are sensitive to the intensity or brightness of the light whereas cone shaped cells are sensitive to colours.
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KUMAR PRAKASHAN-THE HUMAN EYE AND THE COLOURFUL WORLD-OBJECTIVE QUESTIONS AND ANSWERS (Answer the following questions in very short as directed (Miscellaneous) )
  1. In hypermetropia, how does the size of eyeball change ?

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  2. What change occurs in the focal length, when our eye lens becomes thic...

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  3. What are rods and cones ?

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  4. What is cataract ?

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  5. What would have been the colour of the sky, had there been no atmosphe...

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  6. Due to which phenomenon is the colour of water in deep sea blue ?

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  7. What is the cause for presbyopia ?

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  8. Give the relationship between wavelength of light and its angle of dev...

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  9. For which colour has the glass larger refractive index – violet or gre...

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  10. Which part of human eye is also known as 'white of the eye' ?

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  11. Why is blind spot so called ?

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  12. Which liquid is filled in the space between the eye lens and the retin...

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  13. What happens to the pupil of the eye when the light is (a) very bright...

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  14. A man is wearing spectacles of focal length +1 m. What can be the defe...

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  15. Which portion of a bi-focal lens is (a) a concave lens (b)a convex l...

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  16. When sunlight enters into a room filled with dark smoke, its path beco...

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  17. What is the function of the iris ?

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  18. What are light sensitive cells ?

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  19. What type of signals are generated and sent to the brain by light sens...

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  20. What holds the crystalline lens in the human eye?

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