A) \[2b\lambda +e\]
B) \[\frac{2b\lambda }{e}\]
C) \[\frac{2b\lambda }{e}+e\]
D) \[\frac{2b\lambda }{e}-e\]
Correct Answer: C
Solution :
The direction in which the first minima occurs is \[\theta \] (say). Then \[e\sin \theta =\lambda \] or \[e\theta =\lambda \] or, \[\theta =\frac{\lambda }{e}\] \[(\because \,\,\,\theta =\sin \theta \] when \[\theta \] small) Width of the central maximum \[=2b\theta +e=2b.\frac{\lambda }{e}+e\]You need to login to perform this action.
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