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<blockquote data-quote="hanadr" data-source="post: 89976" data-attributes="member: 8110"><p>Beware textbooks :evil: . They perpetuate errors from one generation to the next. I have elementary Physics books which list the colours of the rainbow as Red, Orange, Yellow, Green, Blue, Indigo and Violet. they even give you a neat mnemonic to help you remember"Richard Of York Gained Battles In Vain"</p><p> I look out of the window at a rainbow or make one with a prism and I cannot see blue AND indigo. There is definitely a shade of blue there, but it's not indigo.</p><p>A similar textbook tells me that if Ilook at a yellow object under a pure yellow light, ( sodium streetlamp will do), the object looks yellow. I've done it and the object is indistinguishable from white. Yes I do have perfect colour vision 8) </p><p> The writer of that textbook, completely missed Edwin Land's work on colour vision. There are 2 components to seeing colour. one is the physics of light, the other is the function of the eye. The bit they forgot </p><p> The same kind of nonsense ends up in books on nutrition. Viz, the work of Ancel Keys, which displaced the work of John Yudkin in the textbooks. However Keys's work was based on assumpions and Yudkin's on meticulous research.</p></blockquote><p></p>
[QUOTE="hanadr, post: 89976, member: 8110"] Beware textbooks :evil: . They perpetuate errors from one generation to the next. I have elementary Physics books which list the colours of the rainbow as Red, Orange, Yellow, Green, Blue, Indigo and Violet. they even give you a neat mnemonic to help you remember"Richard Of York Gained Battles In Vain" I look out of the window at a rainbow or make one with a prism and I cannot see blue AND indigo. There is definitely a shade of blue there, but it's not indigo. A similar textbook tells me that if Ilook at a yellow object under a pure yellow light, ( sodium streetlamp will do), the object looks yellow. I've done it and the object is indistinguishable from white. Yes I do have perfect colour vision 8) The writer of that textbook, completely missed Edwin Land's work on colour vision. There are 2 components to seeing colour. one is the physics of light, the other is the function of the eye. The bit they forgot The same kind of nonsense ends up in books on nutrition. Viz, the work of Ancel Keys, which displaced the work of John Yudkin in the textbooks. However Keys's work was based on assumpions and Yudkin's on meticulous research. [/QUOTE]
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