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Fill in the following blanks with suitable words :(a) The reciprocal of the focal length in metres gives you the __________ of the lens, which is measured in __________.(b) For converging lenses, the power is __________ while for perging lenses, the power is__________.
(a) The reciprocal of the focal length in metres gives you the power of the lens, which is measured in dioptres.
(b) For converging lenses, the power is positive while for diverging lenses, the power is negative.
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