#PhysicsFactlet
The human eyes have "only" 3 different colour receptors, so multiple spectra can be perceived as the same colour.
(And this without considering all the ways the signal is processed before you actually "see" it.) #Optics#Colour#Color#Vision
If you’ve noticed a green-colored flash with the sun on the horizon just after sunset or before sunrise, consider yourself lucky. What causes these brief, rare and colorful spectacles? They’re the result of sunlight being separated into different colors, an optics researcher at the University of Glasgow explains. Live Science has more, including how and where you will more likely to see a green flash at dusk or dawn. https://flip.it/FDQgx2 #Science#Earth#Color#Sun#Scenery#Sunrise#Sunset