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An interference pattern is obtained by using red light. If in the same set up red light is replaced by blue light the fringe width will



(c)remain same

(d)will become faint

1 Answer

The fringe width $\beta= \large\frac{\lambda D}{d}$
$ \therefore \beta \;\alpha\; \lambda$
as $\lambda _{Blue} < \lambda _{red}$
the fringe width will decreases.
Hence B is the correct answer.
answered Jan 21, 2014 by meena.p

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