A person cannot see distinctly objects kept b | vedclass

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(C) The person is suffering from myopia (near-sightedness) because they cannot see objects beyond $2\, m$.To correct this defect, a concave lens is us

Vedclass · Accepted Answer

$-0.5\, D$

Vedclass · Answer

(C) The person is suffering from myopia (near-sightedness) because they cannot see objects beyond $2\, m$.To correct this defect, a concave lens is used to bring the image of an object at infinity to the person's far point $(2\, m)$.Here, the object distance $u = \infty$ and the image distance $v = -2\, m$.Using the lens formula: $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$.Substituting the values: $\frac{1}{f} = \frac{1}{-2} - \frac{1}{\infty} = -0.5\, m^{-1}$.Since power $P = \frac{1}{f(	ext{in meters})}$, we get $P = -0.5\, D$.

$A$ person cannot see distinctly objects kept beyond $2\, m$. This defect can be corrected by using a lens of power:

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