a 52 year old near sighted person wear eye glass with power -5.5D for distance viewing.his doctor prescribe the correction of 1.5D in the neae vision section of his bifocal.this is measured relative to the main parts 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?
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Sorry IDK
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