a student is unable to see clearly the words written on the black board placed at a distance of approximately 3m from him . name the defect of vision the boy is suffering from . state the possible causes of the defect and explain the method of correcting it .
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The defect is myopia
Causes- excessive curvature of the eye lens;elongation of the eyeball
X=3m
Focal length = -x
So f =-3
Power =1/f =1/-3 = -0.333D
Hence a concave lens of power -0.333D is required to correct the defect
Hope it helped ta
Causes- excessive curvature of the eye lens;elongation of the eyeball
X=3m
Focal length = -x
So f =-3
Power =1/f =1/-3 = -0.333D
Hence a concave lens of power -0.333D is required to correct the defect
Hope it helped ta
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not having of vitamin a
liza29:
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of sst and science only
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