A man with defective eyes cannot see objects | vedclass

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Question

(C) The man is suffering from myopia (nearsightedness) because he cannot see distant objects clearly.To correct this defect, we use a concave lens tha

Vedclass · Accepted Answer

$- 1.66 \, D$

Vedclass · Answer

(C) The man is suffering from myopia (nearsightedness) because he cannot see distant objects clearly.To correct this defect, we use a concave lens that forms a virtual image of an object at infinity at the man's far point $(60 \, cm)$.Here, the object distance $u = \infty$ and the image distance $v = -60 \, cm = -0.6 \, m$.Using the lens formula: $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$.$\frac{1}{f} = \frac{1}{-0.6} - \frac{1}{\infty} = -\frac{1}{0.6}$.Power $P = \frac{1}{f(	ext{in meters})} = -\frac{1}{0.6} = -1.66 \, D$.

$A$ man with defective eyes cannot see objects distinctly at a distance of more than $60 \, cm$ from his eyes. The power of the lens to be used will be:

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