What is the effect on the interference fringes of young’s double slit experiment when a) the width of source slit is increased b) the monochromatic source is replaced by a source of white light?
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a) The path difference to the central fringe is zero for all colours. Hence each colour produces a bright fringe here .As they overlap, a white fringe is formed.
b) In white light ,there are different colours (Wavelengths).The fringe of one colour is slightly displaced from the fringe of other colours of the same order .Thus, the fringes of different colours do not exactly overlap.
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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.
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