If the monochromatic source in Young's double slit experiment is replaced by white light, then (a) Interference pattern will disappear (b) There will be a central dark fringe surrounded by a few coloured fringes (c) There will be a central bright white fringe surrounded by a few coloured fringes (d) All bright fringes will be of equal width

Answer: (c). At the centre the path difference is zero for every wavelength, so all colours overlap there: central fringe is white. Away from the centre fringes of different λ separate, giving a few coloured fringes before they wash out. So the answer is (c).

If the monochromatic source in Young's double slit experiment is… | NEET 2024

Q25NEET 2024Easy

YDSE: Fringe Width & Fringe Positions

If the monochromatic source in Young's double slit experiment is replaced by white light, then

Show answer and solution

Answer: (c)

At the centre the path difference is zero for every wavelength, so all colours overlap there: central fringe is white.
Away from the centre fringes of different $\lambda$ separate, giving a few coloured fringes before they wash out.
So the answer is (c).

Report a mistake

YDSE: Fringe Width & Fringe Positions question from NEET 2024

More questions on YDSE: Fringe Width & Fringe Positions