If the monochromatic source in Young's double slit experiment is replaced by white light, then: (1)

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Question

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

Accepted Answer

Correct Answer: C — There will be a central bright white fringe surrounded by a few coloured fringesStep-by-step Solution:White light consists of all visible wavelengths. At the central maximum (zero path difference), all wavelengths interfere constructively, producing a white fringe. On either side, for a given path difference, different wavelengths have different fringe positions, so coloured fringes appear. After a few fringes, the pattern becomes indistinct due to overlapping. Thus the correct observation is a central white bright fringe flanked by coloured fringes.Key Concepts: Young's double slit experiment, white light interference, central white fringe.

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