A) 900 nm
B) 700 nm
C) 300 nm
D) none of these
Correct Answer: B
Solution :
\[\frac{(2n-1){{\lambda }_{1}}D}{2D}\,\,=\,\,\frac{m{{\lambda }_{2}}D}{d}\] \[\frac{(2n-1)400}{2}\,\,=\,\,2{{\lambda }_{2}}\] \[{{\lambda }_{2}}\,\,=\,\,\frac{7}{4}\,\,\times 400\,\,=\,\,700\,nm\]You need to login to perform this action.
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