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One of the most important things to remember for the visual spectrum that may show up on a test is that blue/violet have the lowest wavelength (close to 400nm) while red has the largest (around 700nm), which means blue light has higher energy than red light.
I believe that all light is measurable, thats why we know the wavelengths for all the types of light on the electromagnetic spectrum, but visible light is just a category of this measurable light that has 400-700nm wavelength
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