Q26 of 234 Page 279

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

The defect of vision due to which a person cannot see the nearby objects clearly (though he can see the distant object clearly) is known as hypermetropia. By using convex lens this defect of vision can be corrected.


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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.

 25

Explain with the help of labelled ray diagram, the defect of vision called myopia 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?

 28

The near-point of a person suffering from hypermetropia is at 50 cm from his eye. What is the nature and power of the lens needed to correct this defect? (Assume that the near-point of the normal eye is 25 cm).