A) 1.78
B) 1.25
C) 1.59
D) 1.69
Correct Answer: A
Solution :
\[{{X}_{1}}={{X}_{\text{5th}\,\text{dark}}}=(2\times 5-1)\frac{\lambda D}{2d}\] \[{{X}_{2}}={{X}_{\text{8th}\,\text{dark}}}=8\frac{\lambda D}{\mu d}\] \[{{X}_{1}}={{X}_{2}}\] \[\frac{9}{2}\frac{\lambda /D/}{d/}=8\frac{\,\lambda /D/}{\mu d/}\] \[\mu =\frac{16}{9}=1.78\]You need to login to perform this action.
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