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A person wear spectacles of power-2.3 D ...

A person wear spectacles of power-2.3 D Name the defect of vision he is suffering from.Draw the ray diagram for: The defective eye

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A person wear spectacles of power-2.3 D Name the defect of vision he is suffering from.Draw the ray diagram for: Its correction after using a suitable lens.

A person can not see clearly objects beyond a distance of 1.2 m.Name the defect of vision he is suffering from.What would be the power of correcting lens used to restore proper vision?

A myopic person has been using spectacles of power -1.0D for distant vision. During old age he also needs to use separate reading glass of power +2.0 dioptres. Explain what may have happened.

If aperson uses spectacles of Power +1.0 dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.

What is Accomodation of eye? Write various defects of vision and their cause. How the eye of person suffering from nearsightedness and farsightedness may be corrected ?

A person can see clearly only up to 3 m.What type of defect a person have ? Prescribe a lens for his spectacles, so that he can see clearly up to 12 m.

MBD-THE HUMAN EYE AND THE COLOURFUL WORLD-EXAMPLE
  1. Define the following:Near point

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  2. Define the following : least distance of distinct vision

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  3. A person wear spectacles of power-2.3 D Name the defect of vision he i...

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  4. A person wear spectacles of power-2.3 D Name the defect of vision he i...

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  5. Distiguish between simple microscope and compound microscope

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  6. A person can not see clearly objects beyond a distance of 1.2 m.Name t...

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  7. The near point of a person suffering from hypermetropia is 75 cm. calc...

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  8. The near point of a hypermetropia eye is 1 m find the power of the len...

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  9. A person cannot see object beyond 1.5 m distinctly . What type of lens...

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  10. What do you mean by optical instruments? Name any two.

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  11. What is least distance of distinct vision?

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  12. What is far point ?

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  13. Write a function of each of: Retina

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  14. Wrtie a funciton of each of: Sclerotic

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  15. Write the function of ciliary muscles in human eye.

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  16. What is the function of rods on the retina?

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  17. What are cone cells?

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  18. Why chickens come out late in the morning and return early in the even...

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  19. Explain why (or how): Bats can ascertain distances, directions, nature...

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  20. Colour of eyes depend upon colour of which part of eye?

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