CBSE Class 10 Answered
A person is unable to see objects distinctly placed within 50 cm from his eyes. Name the defect of vision the person suffering from
Asked by akshitbaliyan07 | 18 Mar, 2019, 11:27: AM
Expert Answer
The defect of the eye vision is known as Hypermetropia. This defect is also known as far-sightedness.
A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly.
The near point N as shown in figure (a) , for the person, is farther away from the normal near point N ' (25 cm).
Such a person has to keep a reading material much beyond 25 cm from the eye for comfortable reading.
This is because the light rays from a closeby object are focussed at a point behind
the retina as shown in Fig. (b). This defect arises either because (i) the focal length of the eye lens is too long, or
the retina as shown in Fig. (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. This is illustrated in Fig. (c).
Eye-glasses with converging lenses provide the additional focussing power required for forming the image on the retina.
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