I read that it's difficult to obtain a monochromatic light of a single wavelength. We usually have a range of wavelengths associated with it. Why so?
I saw a similar question posted here: https://www.researchgate.net/post/Can_we_have_strictly_monochromatic_unpolarized_light
I couldn't understand the answers here properly and moreover the question talks of polarization of light as well. Has that got to do anything with my original question?