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Why are some persons colour-blind ? Wha...

Why are some persons colour-blind ? What is the cause of this defect ?

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In the retina of some persons, cone-shaped cells responding to certain specific colours are absent . Hence , these person are unable to distinguish between certain colours i.e., they are colour-blind .
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NAVNEET PUBLICATION - MAHARASHTRA BOARD-LENSES-Answer the following questions :
  1. Explain the working of an astronomical telescope using refraction of l...

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  2. State the used of a telescope.

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  3. Observe the figure and answer the question. Which optical instr...

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  4. Observe the figure and answer the question. This optical instru...

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  5. Observe the figure and answer the question. How can we get diff...

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  6. Observe the figure and answer the question. Draw the figure aga...

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  7. What is persistence of vision ? Give one example of persistence of vi...

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  8. Name two devices whose working is based on the phenomenon of persisten...

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  9. Name any two applications based on persistence of vision.

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  10. How is the phenomenon of persistence of vision used in motion picture...

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  11. Name the two types of ligth sensitive cells present in the retina of t...

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  12. Why do you say that a person is colourblind ?

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  13. Explain the perception of colour of the human eye .

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  14. Explain in short perception of colour.

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  15. Write a note on perception of colour.

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  16. What is colour-blindness ?

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  17. Why are some persons colour-blind ? What is the cause of this defect ...

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  18. What are the difficulties faced by a colour-blind person ?

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  19. Draw a figure explaining various terms related to a lens

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  20. When is the magnification produced by a lens (1) positive (2) negative...

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