A) 10
B) 04
C) 05
D) 09
Correct Answer: C
Solution :
\[{{\lambda }_{g}}=5303\overset{o}{\mathop{\text{A}}}\,,\,\,d=19.44\mu m\],\[a=4.05\mu m\] For diffraction location of first minima;\[{{y}_{1}}=\frac{D\lambda }{a}\] Location of second minima, \[{{y}_{2}}=\frac{2D\lambda }{a}\] For interference, \[d\sin \theta \approx \frac{d{{y}_{1}}}{D}=\frac{d\lambda }{a}=4.80\lambda \] Also,\[d\sin \theta '\frac{d{{y}_{2}}}{D}=\frac{2d\lambda }{a}=9.62\lambda \] Number of bright fringes correspond to n = 5, 6, 7, 8, 9.
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