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

The Correct Option is C

When white light replaces a monochromatic source in Young's double-slit experiment, the interference pattern alters due to white light's multiple wavelengths.

• Central Fringe: A bright white central fringe forms because all wavelengths achieve constructive interference at this point, being in phase.
• Surrounding Fringes: Moving away from the center causes wavelengths to recombine differently, producing colored fringes through dispersion. Each color represents a unique wavelength undergoing constructive or destructive interference at specific locations.

Consequently, the expected outcome is a central bright white fringe bordered by several colored fringes.