Answer:
[tex]x_1-x_2=3cm[/tex]
Explanation:
Two slits with separation, d, and distance from the slits to a screen, L, produce bright fringes. The spacing, x, between the central fringe and the n-order bright fringe.
[tex]x=\lambda*n*L/d[/tex]
The spacing between the first and second bright is:
[tex]x_1-x_2=(n_2-n_1)*\lambda*L/d=(2-1)*600 *10^{-9}m*2.5 m/(0.050*10^{-3}m)=0.03m=3cm[/tex]
