The far point of a myopic eye is at 40 , cm. | vedclass

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Question

(C) For a myopic eye,the far point is at a finite distance instead of infinity. To correct this,a concave lens is used to form an image of an object a

Vedclass · Accepted Answer

$-2.5$

Vedclass · Answer

(C) For a myopic eye,the far point is at a finite distance instead of infinity. To correct this,a concave lens is used to form an image of an object at infinity at the person's far point.Given,the far point $d = 40 \, cm = 0.4 \, m$.The focal length $f$ of the required concave lens is equal to the negative of the far point distance: $f = -40 \, cm = -0.4 \, m$.The power of the lens $P$ is given by the formula $P = \frac{1}{f 	ext{ (in meters)}}$.$P = \frac{1}{-0.4} = -2.5 \, D$.Therefore,the power of the lens required is $-2.5 \, D$.

The far point of a myopic eye is at $40 \, cm$. To correct this defect,the power of the lens required will be: (in $, D$)

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