What color would a black object look under a red light?A cyan object under a blue light?A magenta object under a green light?A red object under a yellow light?A yellow object under a red light?
So much depends on whether an object is wide band or narrow band. If both the source and the destination are narrow band then the target will appear black unless the source has some of the same wavelengths as are in the destination. If the source is broadband and the destination is narrow band then the destination will appear its own colour only. If both are broadband then we must consider the full gamut of wavelengths that they both have in common. eg in the first case it will be bluer than cyan and more cyan than blue. Turquoise? in the second we can say that green contains yellow, green and blue light. Magenta reflects reds and blues. so the blue is in common to both. It might appear blue. Yellow light may contain red, orange, yellow and green. The red object will reflect reds and oranges and some yellow. So the red object may appear orange. Similarly for the yellow object in red light. It all depends on the range of colours that exist in each object ( source and illuminated object )
1. A cyan object absorbs red light and reflects green and blue. Under blue light it looks blue. 2. A magenta object absorbs green light and reflects red and blue. Under green light it looks black. 3. A red object absorbs green and blue light and reflects red. Yellow light is a combination of red and green light. A red object under yellow light it looks red. 4. A yellow object absorbs blue light and reflects red and green. Under red light it looks red.
