Question

when monochromatic light is
replace by white light what will
happen​

Answer 1

Answer:

If a monochromatic ray is passed through a prism, it will emerge out of the prism with certain deviation depending upon its wavelength and frequency. If in place of a monochromatic ray, a ray of white light is passed through a prism, it will display a band of spectrum on the screen.

Explanation:

Answer 2

Answer:

So if monochromatic light in Young's double-slit experiment is replaced by white light, then the waves of every wavelength form their separate interference patterns. ... Hence the waves of all colors reach a middle point R in the same phase. So the central fringe is white.