A) \[\frac{\lambda }{2(5-\sqrt{2})}\]
B) \[\frac{\lambda }{2(\sqrt{5}-2)}\]
C) \[\frac{\lambda }{(5-\sqrt{2})}\]
D) \[\frac{\lambda }{(\sqrt{5}-2)}\]
Correct Answer: B
Solution :
[b] |
At point \[P\,\Delta x=\sqrt{5}d\,\,-\,\,2\,d\] |
\[\Delta \,x=d\left( \sqrt{5}-2 \right)\] |
For first minima \[\Delta \,x\,\,=\,\,\frac{\lambda }{2}\] |
\[d=\,\frac{\lambda }{2(\sqrt{5}-2)}\] |
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