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Neal
Hazard to Others
Posts: 156
Registered: 24-12-2021
Location: Chicago, IL, USA.
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The yellow object can be next to a red object, the red object can be next to the blue object. So wouldn't I get false positives?
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Twospoons
International Hazard
Posts: 1349
Registered: 26-7-2004
Location: Middle Earth
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Mood: A trace of hope...
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Not if you just measure the yellow object. Just like if you want to measure a book you don't measure the entire bookshelf.
Optically this would involve imaging lenses, or a mask, so you are only looking at the object of interest, rather than the average of an entire room.
The attached image is of a fluorescent bulb as seen through a diffraction grating. You will notice there are 5 distinct images, as the bulb emits
light on 5 distinct wavelengths, and the grating separates them out.
Applying this to your yellow object: if it were only reflecting yellow you would see one yellow image; if it were only reflecting red and green you
would see two images , one red and one green. Does that make sense to you?
Most everyday objects reflect a broad band of wavelengths, and so would appear as a rainbow colored smear when viewed through a diffraction grating.
Helicopter: "helico" -> spiral, "pter" -> with wings
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