Ie if we had a light that could emit light from purple to UV. Do we see an instant change from purple to nothing or does it slowly fade out?
In: Physics
If you mean decrease as in the wavelength gets shorter then the color of the light would shift moving from red at the longer wavelengths through the rainbow spectrum down to violet and eventually to ultra violet and your eyes would see nothing. If it was the only light source it would become dark. Unfortunately if the light kept shifting and/or you kept looking for a long while it would begin to damage your eyes.
If you mean decrease as in get longer, the opposite would happen, as the light would get redder and ultimately fade out and become dark again. This light wouldn’t damage your eyes like UV because it’s lower and lower energy.
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