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Name the type of detect of vision a person is suffering from, it he uses convex lens in his spectacle for the correction of his vision. If the power of lens is +0.5D? Find the focal length of the lens? |
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Answer» Convex lens are used to correct presbyopia as the object you see is out of focus convex lens converges the light rays and brings in focus. So, the person is suffering from presbyopia. Focal length=1/(power of lens) =1/+0.5=+2 metres |
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