A) Only the central fringe is white and all other fringes are observed coloured
B) No fringes are observed
C) All the bright fringes become white
D) All the bright fringes are coloured between violet and red
Correct Answer: A
Solution :
When a white light source is used in Young?s double slit experiment, then we observe a central white fringe with a few coloured fringes on both sides. In white light there are different colours (wavelengths) and fringe of one colour is slightly displaced from the fringe of other colour of the same order (since fringe-width depends upon wavelength). Hence, edges of fringes are seen coloured.
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