A) \[6000\,\,{AA}\]
B) \[5000\,\,{AA}\]
C) \[3000\,\,{AA}\]
D) \[1500\,\,{AA}\]
Correct Answer: A
Solution :
For second dark fringe \[d\sin \theta =2\lambda \] \[\Rightarrow \] \[24\times {{10}^{-5}}\times {{10}^{-2}}\times \sin 30=2\lambda \] \[\Rightarrow \] \[\lambda =6\times {{10}^{-7}}\,m\,\,=\,\,6000\,{AA}\]You need to login to perform this action.
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