Question

In Young's double slit experiment, the interference pattern obtained with white light will be

• A. the central fringe bright and alternate bright and dark fringes
• B. the central fringe achromatic and coloured fringes for small path difference
• C. the central fringe dark
• D. the central fringe coloured

Answer 1

The correct option is B the central fringe achromatic and coloured fringes for small path difference

If white light is used a white centre fringe is observed, but all the other fringes have coloured edges, the blue edge being nearer the centre. Eventually the fringes overlap and a uniform white light is produced.

Hence correct answer is option B.