Wave Optics

In Young's double slit experiment, fringe width is 1.4 mm with light of wavelength $6000 \(\mathop {\rm{A}}\limits^{\rm{o}} $. If the light of wavelength $5400\)\mathop {\rm{A}}\limits^{\rm{o}} $ is used, with no other change in the experimental set up. The change in fringe width is