A) \[\frac{\lambda }{\theta }\]
B) \[\frac{\lambda }{2\theta }\]
C) \[\lambda \theta \]
D) \[\frac{2\lambda }{\theta }\]
Correct Answer: A
Solution :
Fringe width, \[\beta =\frac{D\lambda }{d}\] But here, \[\theta =\frac{d}{D}\Rightarrow d=D\theta \] \[\therefore \] \[\beta =\frac{D\lambda }{D\theta }=\frac{\lambda }{\theta }\]You need to login to perform this action.
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