A) fringes will become narrower
B) fringes will become broader
C) no change in fringe width
D) None of the above
Correct Answer: A
Solution :
Width of central maximum is given by \[w=\frac{2f\lambda }{a}\] ? (i) where\[f\]is focal length of lens, a is width of slit and\[\lambda \]is wavelength of light used. From Eq. (i), it is clear that fringe width \[w\propto \lambda \] So, when blue light is used in the experiment instead of red light, the fringes will become narrower.
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