Physics · Wave Optics

NEET (UG) 2024 — Question 24

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

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

Answer: C

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.

Answer key and solution verified before publishing.

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