Yes sometimes ........
The cone cells on the retina.
Butterflies have two sources of color pigmented color and structural color. Browns and yellows come from the pigment melanin, just like how humans tan. Butterflies get their shimmer from structural color, the light passes through multiple layers of their transparent wings and creates multiple reflections of light that intensify their colors.
Phototropism
Red light is very important in that it's the color that phtosynthesizes with chlorophyll.
photoreceptors
First, the leave grows into a light green color, Then to a dark green, Then to a yellow or orange color, Then to a brown color
It absorbs different wavelengths of visible light
You can certainly have a shadow that is another color besides gray. Gray or black shadows are produced when bright white light shines onto something. If you use a different color of light, you can get a different shade to the shadow. Also, you can use different lenses to look at the light and shadow, and that will change the color.
the light will have a different color
color change
Red light, going in a different direction.
the color stays the same
Change the color of the bulb. [mec3usa] merge the green light with red and blue light.
Sure. But there are a whooooole bunch of different frequencies associated with visible light. And a change in color represents a big jump in frequenciy, at least as far as the laser is concerned. The reason the shift in color represents a big jump in frequency for a laser is because the laser is a device which typically produces one color of light. And we can't change the color of the laser by "dialing it in" like controlling the brightness of a light. Each particular "source" of the lasing action emits a particular color of light. It's all about the physics of the lasing material or medium And to make different colors of light we have to find different materials to use in the laser or build a different kind of laser. And we'd have to do this for each color of light! Not an easy thing to do. It may be possible to "blend" basic colors of light (red, green and blue) to "paint" in different colors, but this still presents considerable technical challenges.
"Crystal" might be good, because crystals are clear, but they can change color in the light.... maybe Crystalsun?
change of photons
change of photons