Q. 4
“Monochromatic light should be used to produce pure spectrum”. Comment on this statement.
Answer :
The spectrum is obtained on a white wall or paper when different wavelengths of light get deviated through different angles by a dispersing element. When no two colors overlap each other in this spectrum, it is called a pure spectrum. If monochromatic light is used there will be only one color, not a spectrum.
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HC Verma - Concepts of Physics Part 1