Wave OpticsMedium
Question
If the monochromatic source in Young's double slit experiment is replaced by white light, then
Options
A.There will be a central bright white fringe surrounded by a few coloured fringes
B.All bright fringes will be of equal width
C.Interference pattern will disappear
D.There will be a central dark fringe surrounded by a few coloured fringes
Solution
Sol. [Key Concept: Young's double slit with a white-light source] 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.
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