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When a person suffering from problem in vision met a doctor, he wrote in his prescription the following figures. +1.5 D, -2D1. What has the doctor indicated in the prescription?2. Which are the types of lenses prescribed here? |
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Answer» 1. +1.5 D, -2D indicates the power of lens they required. The power of a lens is defined as the ability of the lens to converge or diverge a beam of light falling on it. 2. The power of a convex lens is positive while the power of a concave lens is negative. +1.5D represents convex lens. -2D represents concave lens. |
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