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Q.

What focal length should the reading spectacles have for a person for whom the least distance of vision is 50 cm ? (The distance of Normal vision is 25 cm)

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Detailed Solution

Near point = v = –50cm
Object distance = u = –25cm
∴1v−1u=1f⇒−150−1(−25)=1f⇒−150+125=1f⇒1f=−1+250=150⇒f=50 cm

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What focal length should the reading spectacles have for a person for whom the least distance of vision is 50 cm ? (The distance of Normal vision is 25 cm)