A short-sighted person can see distinctly onl | vedclass

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(B) short-sighted person (myopic) cannot see objects beyond their far point clearly.Here,the far point of the person is $d = 100\, cm = 1\, m$.To see

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$- 1.0\, D$

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(B) short-sighted person (myopic) cannot see objects beyond their far point clearly.Here,the far point of the person is $d = 100\, cm = 1\, m$.To see a distant object (at infinity),the lens must form a virtual image of the object at the person's far point.Using the lens formula: $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$.Here,$u = \infty$ and $v = -100\, cm = -1\, m$ (since the image must be formed on the same side as the object).$\frac{1}{f} = \frac{1}{-1} - \frac{1}{\infty} = -1 - 0 = -1\, m^{-1}$.Power $P = \frac{1}{f} = -1\, D$.

$(I)$ 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

$A$ short-sighted person can see distinctly only those objects which lie between $10\, cm$ and $100\, cm$ from him. The power of the spectacle lens required to see a distant object is

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