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a person needs a lens of power of -5.5diopters for correcting his distant vision. For correcting is near vision he needs a lens of power + 1.5 diopter what is the focal length of the lens required for correcting distant vision |
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Answer» GIVEN power of lens for corecting DISTANT vision is -5.5D relation between power and focal LENGTH is P=1/f (or) f=1/P f=1/5.5 f=0.1818m (or) f=18.18cm So the focal length REQUIRED to correct the distant vision is 18.18cm. |
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