A person can see clearly objects only when they lie between $$50$$ cm and $$400$$ cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be

Question

A  person can see clearly objects only when they lie between $$50$$ cm     and $$400$$ cm      from his eyes.  In order to increase the maximum distance  of distinct vision to infinity, the type and power of the correcting lens,  the person has to use, will be

Infinity Learn · Accepted Answer

Image  distance, $$v=400cm=4m$$⇒$$u=$$∞       Using  lens equation, $$1v$$−$$1u=1f$$⇒$$1$$−$$4$$−$$1$$∞$$=1f$$⇒$$f=$$−$$4m$$     Now,  power of the required lens is, $$P=1f=1$$−$$4=$$−$$0.25D$$     Thus,  the person require a concave lens of power −$$0.25D$$     .

A person can see clearly objects only when they lie between $50 c m$ and $400 c m$ from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be

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A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be

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free study material

A person can see clearly objects only when they lie between $50 c m$ and $400 c m$ from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be