Question

Why white light is not used in young's double slit experiment?

Answer 1

Because white light is transparent the light

Answer 2

:White light can be thought of to consist of many different wavelengths in different strengths, emitted at not necessarily the same time and place, and not even necessarily in the same direction. It’s a wild mess. While you can observe an interference pattern with a laser beam or a carefully calibrated gas lamp, that is only so because the light is ridiculously simple. It has a very small amount of wavelengths, is emitted more or less consistently in the same direction, etc. It’s basically the ideal thing to work with if you dont wanna deal with complications. And as such, there are fewer with those light sources when trying to see interference — light of one wavelength produces a nice clear interference pattern. Light of two wavelengths of the same intensity gives an interference pattern, still; but it consists of two patterns by two wavelengths.

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