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You have only to look at a spot of reflected laser light to see that it is different from other light. This small spot of very intense light has a characteristic speckled pattern that changes as you move your head. The reasons for this are found in the way it is produced.
Photons of light are emitted from atoms or molecules when an orbital electron moves to a lower energy level. You can find out about energy levels on this CK-12 Foundation website:
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