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Question
The defect hypermetropia can be corrected by using a ..................
The defect hypermetropia can be corrected by using a ..................
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Solution
The correct option is C Convex lens
The defect hypermetropia can be corrected by using a convex lens of appropriate power.Hypermetropia is also known as far -sightedness. A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly. The near point, for the person, is farther away from the normal near point (25cm). Such a person has to keep a reading material much beyond 25cm from the eye for comfortable reading. This is because the light rays from a closeby object are focussed at a point behind the retina (b). This defect arises either because (i) the focal length of the eye lens is too long, or (ii) the eyeball has become too small. This defect can be corrected by using a convex lens of appropriate power. Eye-glasses with converging lenses provide the additional focussing power required for forming the image on the retina.
The defect hypermetropia can be corrected by using a convex lens of appropriate power.
Hypermetropia is also known as far -sightedness. A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly. The near point, for the person, is farther away from the normal near point (25cm). Such a person has to keep a reading material much beyond 25cm from the eye for comfortable reading. This is because the light rays from a closeby object are focussed at a point behind the retina (b). This defect arises either because (i) the focal length of the eye lens is too long, or (ii) the eyeball has become too small. This defect can be corrected by using a convex lens of appropriate power. Eye-glasses with converging lenses provide the additional focussing power required for forming the image on the retina.
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