Physics

Problem

Two monochromatic lights of wavelengths

600\,\text{nm}

and

540\,\text{nm}

illuminate the same double-slit arrangement with slit separation

0.50\,\text{mm}

and screen distance

1.5\,\text{m}

. Calculate the least distance from the central maximum (on one side) at which a bright fringe due to both wavelengths coincides.