Or are we only seeing the higher frequency lights from the flashlight?
In: Physics
You must be referring to UV flashlights… these emit some lower frequencies (violet) which are visible to humans.
Humans can typically only see UV if they are missing the lens portion of the eye.
We can’t see higher frequencies than UV without equipment.
A cheap UV flashlight is not perfect. They do emit UV light but alose light in the visible spectra. So what you see is the small amount of visible light they emit.
Some human eyes can see some UV light or. If the lense is removea is medical treatment the result is that some people report that they can see UV. The lens will filter UV
UV flashlights that have a visible purple glow are emitting that visible purple alongside the UV. Quality lights often have a filter which eliminates all of this visible-spectrum light before you see it, leaving only the UV to fluoresce what’s in front of you
Lower wavelength, but yes. The lights that emit UV rays also (usually) emit violet/blue light as well.
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