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The power of a concave lens is -2.5 dioptres. Find it focal length.Calculate the focal length of a corrective lens having power +2.5 D. |
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Answer» Solution :DATA : Convex lens , `P=-2.5 D , F=?` `P=1/ftherefore -2.5D=1/f` `f=-1/(2.5D) = -0.4 m =-40CM` The focal LENGTH of the lens = -40cm. |
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