Q107 / 200 · NEET 2024 · Physics

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

A
There will be a central dark fringe surrounded by a few coloured fringes
Correct answer
B
There will be a central bright white fringe surrounded by a few coloured fringes
C
All bright fringes will be of equal width
D
Interference pattern will disappear

Solution

At central point on screen, path difference is zero for all wavelength. So, central bright fringe is white and other fringes depend on wavelength as $\beta=\frac{\lambda D}{d}$. Therefore, other fringes will be coloured.

Hence, the correct answer is option: 'B'.

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