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Home  >>  JEEMAIN and NEET  >>  Physics  >>  Class12  >>  Wave Optics

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

(a)increases

(b)decreases

(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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