Q25 of 234 Page 279

Explain with the help of labelled ray diagram, the defect of vision called myopia and how it is corrected by a lens.

The defect of vision due to which a person cannot see the distance objects clearly (though he can see the nearby objects clearly) is known as myopia or short sightedness. By using concave lens this eye defect can be corrected.


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23

Name the defect of vision which can be corrected by a converging lens. Show clearly by a ray diagram how the lens corrects the defect.

 24

Name the defect of vision which can be corrected by a diverging lens. Show clearly by a ray diagram how the lens corrects the defect.

 26

Explain with the help of labelled ray-diagram, the defect of vision called hypermetropia, and how it is corrected by a lens.

 27

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