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It is said that light needs to be monochromatic for interference to take place, what does it mean for light to be monochromatic?

It is said that light needs to be monochromatic for interference to take place, what does it mean for light to be monochromatic? Correct Answer Light has to be of a single frequency

For interference the two waves have to be of the same frequency or else the interference will not be stable and the band lengths and distances will keep varying. Usually a laser is used which is split to form two monochromatic sources is used to demonstrate interference.

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