A) increase
B) decrease
C) remain unaffected
D) first increase and then decrease
Correct Answer: A
Solution :
Using the relation for fringe width \[\beta =\frac{D\lambda }{2d}\] hence, \[\beta \propto \lambda \] Since, \[{{\lambda }_{red}}>{{\lambda }_{yellow}}\] Therefore using the red light in place of yellow light, fringe width will increase.
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