Question

If the monochromatic source in Young's double slit experiment is replaced by white light,
1. There will be a central dark fringe surrounded by a few coloured fringes
2. There will be a central bright white fringe surrounded by a few coloured fringes
3. All bright fringes will be of equal width
4. Interference pattern will disappear

• 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 1

Answer: (C)

there will be a central bright white fringe surrounded by a few coloured fringes.

Answer 2

With white light, all wavelengths interfere. The central fringe is white due to constructive interference, while other fringes are coloured due to wavelength dependence.