When is the power of the lens (a) positive (b) negative?
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object is placed in the 1st aperture
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Focal length of a converging i.e. convex lens is considered positive and focal length of a diverging lens i.e. concave lens is negative. Therefore power of a convex lens e is positive and that of a concave lens e is negative. Hence, if power is negative this means focal length is negative and we have a diverging lens.
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