A man suffering from myopia can read a book p | vedclass

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Question

(C) For a myopic eye,the lens must form a virtual image of an object placed at the desired distance $(u)$ at the person's far point $(v)$.Given: Desir

Vedclass · Accepted Answer

$-12$

Vedclass · Answer

(C) For a myopic eye,the lens must form a virtual image of an object placed at the desired distance $(u)$ at the person's far point $(v)$.Given: Desired object distance $u = -60 \ cm$.Given: Far point of the person $v = -10 \ cm$.Using the lens formula: $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$.Substituting the values: $\frac{1}{f} = \frac{1}{-10} - \frac{1}{-60}$.$\frac{1}{f} = -\frac{1}{10} + \frac{1}{60} = \frac{-6 + 1}{60} = -\frac{5}{60}$.$\frac{1}{f} = -\frac{1}{12}$.Therefore,$f = -12 \ cm$.

$A$ man suffering from myopia can read a book placed at $10 \ cm$ distance. For reading the book at a distance of $60 \ cm$ with relaxed vision,the focal length of the lens required will be ...... $cm$.

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