LIGHT IS LIKE A NOODLE LONG AND STRAINABLE
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To me, this subject (light wavelengths) was almost as confusing as electromagnetism. That might be because of its complexity. To my understanding this is light. Light coming from the sun comes in all lengths. It can be red, blue, green or whatever. When this light passes through an object indirectly to us, photons are added to the hit object. Due to electromagnetism the excited particle (on the way down) releases light. This we can observe in spikes on a graph, water, our atmosphere, and many other things. When light passes through an object and hits us, there are gaps in the light. These gaps can help us decide the object the light passes through. This is like a straining effect. You can try it on your own or use the example I gave you. -- The Brain