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Two slits are made \(1\;\mathrm{mm}\) apart and the screen is placed \(1\;\mathrm{m}\)  away. What is the fringe separation when blue-green light of wavelength \(500\;\mathrm{nm}\)  is used?

Answer

Given data,
\(d=1\;\mathrm{mm}=10^{-3}\;\mathrm{m}\)
\(D=1\;\mathrm{m}\)
\(\lambda =500\;\mathrm{nm}\)
We know, fringe separation,
\(W=\frac{\mathit{\lambda D}} d\)
\(=\frac{500\times 10^{-9}\times 1}{10^{-3}}\)
\(=5\times 10^{-4}\;\mathrm{m}\)
\(=0{\cdot}5\;\mathrm{mm}\) 
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