A child is sitting in the classroom in the back seat is not able to view wgat is written on the blackboard. What defect does he suffer from ? What type of lens should be provided to him to correct the defect ?
Answers
Answer:
(a) The child is not able to read clearly the writing on the blackboard. The child’s eye is suffering from Myopia.
(b) This defect can be removed by using a concave lens.
Explanation:
If distant objects appear to be blurred or not clearly visible then the student has near-sighted, or myopia. In this case a concave lens is used to correct the problem.
Myopia is also known as near-sightedness. A person with myopia can see nearby objects clearly but cannot see distant objects distinctly. A person with this defect has the far point nearer than infinity. Such a person may see clearly upto a distance of a few metres. In a myopic eye, the image of a distant object is formed in front of the retina and not at the retina itself. This defect may arise due to (i) excessive curvature of the eye lens, or (ii) elongation of the eyeball. This defect can be corrected by using a concave lens of suitable power. A concave lens of suitable power will bring the image back on to the retina and thus the defect is corrected.
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