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Find the focal length of a lens of power -2.0 D. What type of lens is this ? |
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Answer» Solution :Given that power of LENS P = -2.0 D As power `P = (1)/(F)`, hence focal LENGTH of lens `f = (1)/(P) = (1)/(-2.0 D) = - 0.5 m` The -ve sign of focal length MEANS that the lens is a concave lens. |
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