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

Can you answer this question?

1 Answer

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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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