A man can see clearly up to 3 , m. Prescribe | vedclass

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(C) The man suffers from myopia (nearsightedness). To see objects at infinity or a distant point $u = -12 \, m$,the lens must form a virtual image at

Vedclass · Accepted Answer

$-1/4 \, D$

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(C) The man suffers from myopia (nearsightedness). To see objects at infinity or a distant point $u = -12 \, m$,the lens must form a virtual image at his far point $v = -3 \, m$.Using the lens formula: $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$.Substituting the values: $P = \frac{1}{f} = \frac{1}{-3} - \frac{1}{-12}$.$P = -\frac{1}{3} + \frac{1}{12} = \frac{-4 + 1}{12} = -\frac{3}{12} = -0.25 \, D$.Thus,the required power is $-1/4 \, D$.

$A$ man can see clearly up to $3 \, m$. Prescribe a lens for his spectacles so that he can see clearly up to $12 \, m$.

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