A) \[2\times {{10}^{-5\,}}\,m\]
B) \[2\times {{10}^{-3\,}}\,m\]
C) \[0.2\times {{10}^{-5\,}}\,m\]
D) none of these
Correct Answer: D
Solution :
Fringe width \[\text{=}\frac{\lambda D}{d}\] ?(1) Given: \[\lambda =1000\overset{\text{o}}{\mathop{\text{A}}}\,\,={{10}^{-5}}\,cm,\,d=3\,cm,\,D=7\,cm\] Putting given value in eq (i) \[\therefore \] \[\beta =\frac{{{10}^{-5}}\times 7}{3}\] \[=2.3\times {{10}^{-5}}\,cm=2.3\times {{10}^{-7}}m\]
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