In Young's double slit experiment, if monochromatic light is repl… - Vidyadip

MCQ

In Young's double slit experiment, if monochromatic light is replaced by white light

✓
(a) All bright fringes become white
B
(b) All bright fringes have colours between violet and red
C
(c) Only the central fringe is white, all other fringes are coloured
D
(d) No fringes are observed

✓

Answer

Correct option: A.

(a) All bright fringes become white

(a) In conventional light source, light comes from a large number of independent atoms, each atom emitting light for about 10 . sec i.e. light emitted by an atom is essentially a pulse lasting for only 10 sec. Light coming out from two slits will have a fixed phase relationship only for $10 sec$. Hence any interference pattern formed on the screen would last only for $10 sec$, and then the pattern will change. The human eye can notice intensity changes which last at least for a tenth of a second and hence we will not be able to see any interference pattern. In stead due to rapid changes in the pattern, we will only observe a uniform intensity over the screen.

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