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A person suffering from the eye-defect m...

A person suffering from the eye-defect myopia (short-sightedness) can see clearly only up to a distance of 2 meters. What is the nature and power of lens required to rectify this defect ?

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The correct Answer is:
Concave lens ; - 0.5 D
NA
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(a) What is short-sightedness ? State the two causes of short-sightedness (or myopia). With the help of ray diagram, show : (i) the eye-defect short-sightedness. (ii) correction of short-sightedness by using a lens. (b) A person having short-sight cannot see objects clearly beyond a distance of 1.5 m. What would be the nature and power of the corrective lens to restore proper vision ?

LAKHMIR SINGH & MANJIT KAUR-THE HUMAN EYE AND THE COLOURFUL WORLD -Exercise
  1. Example with the help of labelled ray diagram, the defect of vision ca...

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  2. Explain with the help of labelled ray-diagram, the defect of vision ca...

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  3. A person suffering from the eye-defect myopia (short-sightedness) can ...

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  4. What is presbyopia ? Write two causes of this defect. Name the type of...

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  5. When is a person said to have developed cataract in his eye ? How is t...

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  6. Fill in the following blanks with suitable words : A person is short...

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  7. The human eye can focus objects at different distances by adjusting th...

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  8. The defect of vision which cannot be corrected by using spectacles is ...

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  9. A person cannot see the distant objects clearly (though he can see the...

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  10. Though a woman can see the distant objects clearly, she cannot see the...

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  11. A young man has to hold a book at arm's length to be able to read it c...

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  12. After testing the eye of a child, the optician has prescribed the foll...

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  13. A student sitting on the last bench in the class cannot read be writin...

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  14. A man driving a car can read a distant road sign clearly but finds dif...

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  15. The defect of vision which the eye-lens of a person gets progressively...

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  16. A person cannot see distant objects clearly. His vision can be correct...

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  17. A person finds difficulty in seeing nearby objects clearly. His vision...

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  18. In a certain murder investigation, it was important to discover whethe...

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  19. The near point of a long-sighted person is 50 cm from the eye. (a) C...

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  20. A person can read a book clearly only if he holds it at an arm's lengt...

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