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CBSE Class 10 Answered

1.a person cannot see objects farther than 2 cm from the eye clearly.what defect of vision is he suffering from?
Asked by nithi | 13 Mar, 2013, 11:54: AM
Expert Answer

Since the person is not able to see farther than 2 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

2 cm

? Power of the lens = -(1/f) = -100/2 = -50 D

Hence, a concave lens of power 50 D is required to correct the given defect of vision.

Answered by | 13 Mar, 2013, 03:59: PM
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