Question

What changes occur, if the monochromatic light used in Young's double slit experiment is replaced by white light?

• A. Only the central fringe is white and all other fringes are observed coloured
• B. No fringes are observed
• C. All the bright fringes become white
• D. All the bright fringes are coloured between violet and red

Answer 1

The correct option is A Only the central fringe is white and all other fringes are observed coloured

If a white light is used in the double slit experiment, the different colours will be split up on the viewing screen according to their wavelengths. The violet end of the spectrum (with the shortest wavelengths) is closer to the central fringe, with the other colours being further away in order.