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A 52-year old near-sighted person wears …

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A 52-year old near-sighted person wears eye-glass with a power of -5.5 dioptres for distance viewing. His doctor prescribes a correction of +1.5 dioptres in the near-vision section of his bi-focals. This is measured relative to the main part of the lens (i) What is the focal length of his distance-viewing part of the lens? (ii) What is the focal length of the near-vision section of the lens? (5 Mark question)

Posted by Vidhya Vijay Baskar 5 years, 1 month ago

CBSE > Class 10 > Science

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