A student cannot see clearly a chart hanging on a wall placed at a distance of $3 m$ from his eyes. The defece is suffering from is[25][26] [[1]].

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Detailed Solution

A student cannot see clearly a chart hanging on a wall placed at a distance of

3 m

from his eyes. The defect of vision, he is suffering from is myopia.[27][28][29][30]
One of the students has myopia. A person can see close objects clearly but not far ones due to a deficiency in their eye's ability to focus on light.
myopia's root causes. Due to the elongation of the eyeball and a reduction in the focal length of the eye lens, myopia is brought on. More convergence occurs in the ocular lens.
Such a person's glasses can be fitted with a concave lens with a sufficient focal length to treat their myopia.

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