A man who cannot see clearly beyond 5 , m wan | vedclass

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(C) The man suffers from myopia (nearsightedness),where the far point is limited to $5 \, m$. To see distant objects (stars) clearly,the lens must for

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$-5$

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(C) The man suffers from myopia (nearsightedness),where the far point is limited to $5 \, m$. To see distant objects (stars) clearly,the lens must form a virtual image of an object at infinity at the man's far point. Given: Object distance $u = \infty$,Image distance $v = -5 \, m$ (using sign convention). Using the lens formula: $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$. Substituting the values: $\frac{1}{f} = \frac{1}{-5} - \frac{1}{\infty}$. Since $\frac{1}{\infty} = 0$,we get $\frac{1}{f} = -\frac{1}{5}$. Therefore,$f = -5 \, m$.

$A$ man who cannot see clearly beyond $5 \, m$ wants to see stars clearly. He should use a lens of focal length ....... $m$.

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