Ultraviolet (UV) light has a higher frequency (and a shorter wavelength and shorter period) than violet light. It is more energetic, too. We can't see UV light as our eyes only see up through violet....
Ultraviolet light (UV light) is light of shorter wavelength than the visible spectrum. Many insects, like bees, see mostly UV light so they can find plants with nectar. Sunlight contains UV light and...
Light will not interfere with another light. It will not combine either. Even laser beams will not interfere with one another if crossed. Only phonons in a material will react with one another.