In Young's double slit experiment if monochromatic light is replaced by white light

Options

A. all bright fringes become white
B. all bright fringes have coloures between violet and red
C. only the central fringe is white all other fringes are coloured
D. no fringes are observed.

Answer

C

Explanation

Central fringe is that fringe where the path difference `Deltax=0` for all wavelengths so the central fringe is white followed by the some coloured fringes and after that there is very much overlapping in fringes so equal illumination exists.