A) 0.1mm
B) 0.2mm
C) 0.3 mm
D) 0.4 mm
Correct Answer: B
Solution :
Position of nth minima \[{{y}_{n}}=\frac{n\lambda D}{d}\] \[\Rightarrow \] \[({{y}_{3}}-{{y}_{1}})=\frac{\lambda D}{d}(3-1)=\frac{2\lambda D}{d}\] \[\Rightarrow \] \[3\times {{10}^{-3}}=\frac{2\times 6000\times {{10}^{-10}}\times 0.5}{d}\] \[\Rightarrow \] \[d=0.2\times {{10}^{-3}}m=0.2mm\]
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