Physics

Problem

A source emits two wavelengths,

\lambda_{1} = 600\,\text{nm}

and

\lambda_{2} = 450\,\text{nm}

. Find the least distance from the central maximum where the bright fringes of both wavelengths coincide. The separation between the slits is

1.0\,\text{mm}

and the screen is

1.0\,\text{m}

away.