\(D =1\,m\)
\(\lambda=600 \times 10^{-9}\,m\)
\(n =5\)
\(\text { As } y _{ nth }=\frac{ n \lambda D }{ d }\)
\(\Rightarrow \frac{5 \times 600 \times 10^{-9} \times 1}{ d }=5 \times 10^{-2}\)
\(\Rightarrow d =\frac{5 \times 600 \times 10^{-9} \times 1}{5 \times 10^{-2}}=60 \times 10^{-6}\,m\)
\(\Rightarrow d =60\,\mu m\)