A) Becomes infinite
B) Decreases
C) Increases
D) Remains unchanged
Correct Answer: B
Solution :
fringe width \[\beta =\frac{\lambda \operatorname{D}}{\operatorname{d}}\] \[{{\lambda }_{\operatorname{w}}}=\frac{\lambda }{{{\mu }_{\operatorname{w}}}}\] \[{{\beta }_{\operatorname{w}}}=\frac{\beta }{\mu }\] fringe width decreases
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