A) no fringes are observed
B) only central fringe is white, all other fringes are colored
C) all bright fringes become white
D) all bright fringes have colours between violet and red
Correct Answer: B
Solution :
In Youngs double slit experiment if white light is used instead of monochromatic light, then we shall get a white fringe at the centre surrounded on either side with some coloured fringes, with violet fringe in the beginning and red fringe in the last. This is due to the fact that a white light emits light waves of many wavelength (from \[4000\overset{o}{\mathop{A}}\,\] to \[7900\overset{o}{\mathop{A}}\,\]), so we get different interference patterns from light of each wavelength.
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