The far point of a myopic person is $80 c m$ in front of the eye. What is the nature and power of lens required to correct the problem?

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Solution

The person is suffering from myopia and hence need a concave lens to correct the defect. The lens should be such that an object at infinity must form its image at the far point.
Hence, $f = - 80 c m = - 0.8 m$
The power of the lens can be obtained as:
$P = \frac{1}{f}$
$P = \frac{1}{(- 0.8)} = - 1.25 D$

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The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of lens required to correct the problem?

The person is suffering from myopia and hence need a concave lens to correct the defect. The lens should be such that an object at infinity must form its image at the far point. Hence, f=−80 cm=−0.8 mThe power of the lens can be obtained as:P=1fP=1(−0.8)=−1.25 D

The far point of a myopic person is $80 c m$ in front of the eye. What is the nature and power of lens required to correct the problem?