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OR. A person cannot see objects beyond 80 cm from his eye while a person with normal eyesightcan see object easily placed upto 160 cm from the eye. Find the nature, the focal length and thepower of the correcting lens. |
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Answer» The defect of vision is myopia. Using the formula 1/f = 1/v - 1/u Given u = - 180 cm, v = - 80 cm1/f = - 1/80 + 1/160 = - 1/160 f = - 160 cm Power = 1/f( in metres) = - 1/1.60 = - 0.625 D A concave lens of focal length 4 m should be used. plz explain how 4 cm comes out |
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