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The power of a lens is + 2.0 D. Its focal length should be : (a) 100 cm (b) 50 cm (c) 25 cm (d) 40 cm |
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Answer» The power of a lens is + 2.0 D. Its focal length should be : (a) 100 cm (b) 50 cm (c) 25 cm (d) 40 cm |
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