A parallel beam of light of wave length 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen i m away . It is observed that the first minimum is at a distance of 2,5 nm from the center of the screen . Find the width of the slit .

Question

$\begin{array}{1 1} 0.2 \;mm \\ 0.2 \; cm \\ 2 \;mm \\ 2\;cm \end{array} $