> Q. The power of a lens, a short sighted person uses is -2 D. Find the maximum distance of an object which he can see without spectacles: – LIVE ANSWER TODAY

Q. The power of a lens, a short sighted person uses is -2 D. Find the maximum distance of an object which he can see without spectacles:

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The power of a lens, a short sighted person uses is -2 D. Find the maximum distance of an object which he can see without spectacles:

Solution:

Image is formed at focus. We know that Power

$ (P)=frac{text{1}}{text{focal},text{length},text{(m)}} $ Given $ P=-2D $

$ therefore $ $ text{Focal},text{length},=-frac{1}{2}=-0.5,m $

$ Rightarrow $ $ F=-50,cm $

Hence, maximum distance of an object, which he can see without spectacles is 50 cm.

Solution Image

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