I already know that visible light is only a tiny fraction of the electromagnetic spectrum, and just after that comes UV radiation, since its wavelength is shorter and thus frequency is higher. My question is: if you can ONLY see visible light, then why can you often see UV light as purple? Isn’t it supposed to be invisible? I’m referring to those commercial torches that emit UV (and purple) light.
In: Physics
In addition to what other people have said, we all expect it to be purple so why filter that out and add a green or red light now? Like you know when there’s ultra violet light this way. Sort of like how we could make car doors much quieter, but choose not to for ease of use.
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