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Telegraph GK crossword

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08012006 | 10:25 Sat 09th Jan 2010 | Quizzes & Puzzles
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As Seekerz has given the answer to 33a, who can tell me what "400-740 nm" means
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blue sky light conditions?
that is around the spectrum range for human vision
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Thanks but what does nm stand for; obviously not nautical miles in this instance
Nanometre
nm = nanometre = wavelength (from ultraviolet to infrared )

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Telegraph GK crossword

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