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A person can see objects between 35cm to 400 cm. What defect is he suffering from? give a correction for this defect.

Asked by 13th March 2013, 12:52 AM
Answered by Expert

Since the person is not able to see farther than 400 cm, he is suffering from myopia. Hence, a concave lens of suitable power is required to correct his defect. The focal length of the lens is given by his far point i.e.,

Focal length =  Far point

400 cm

? Power of the lens = -(1/f) = -100/400 = -.25 D

Hence, a concave lens of power .25 D is required to correct the given defect of vision.

Answered by Expert 13th March 2013, 3:53 PM
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