Isaac Newton discovered that when white light travels through a prism, a rainbow appears, this is called a spectrum. One is usually taught that the spectrum contains 7 colors: red, orange, yellow, green, blue, indigo and violet. But in reality there are only 6 (indigo does not exist). The colors of the spectrum actually correspond to the different wavelengths of light. When the different wavelengths travel through the prism they bend at different angles. This is a continuous spectrum. But there is also a different spectrum called the line spectrum.
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