For the myopic eye,the defect is cured by

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(B) In myopia,the far point of the eye is at a finite distance $d$ instead of infinity. To correct this,we need a lens that forms an image of an objec

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Concave lens

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(B) In myopia,the far point of the eye is at a finite distance $d$ instead of infinity. To correct this,we need a lens that forms an image of an object at infinity at the far point $d$ of the myopic eye.Using the lens formula: $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$Here,$u = -\infty$ and $v = -d$ (since the image must be formed at the far point).Substituting these values: $\frac{1}{f} = \frac{1}{-d} - \frac{1}{-\infty} = -\frac{1}{d} + 0$Therefore,$f = -d$.Since the focal length $f$ is negative,a concave lens is used to correct myopia.

$(I)$ Presbyopia	$(A)$ Sphero-cylindrical lens
$(II)$ Hypermetropia	$(B)$ Convex lens of proper power may be used close to the eye
$(III)$ Astigmatism	$(C)$ Concave lens of suitable focal length
$(IV)$ Myopia	$(D)$ Bifocal lens of suitable focal length

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