Physics

Problem

Two different monochromatic lights of wavelengths

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

and

\lambda_{2}=400\,\text{nm}

fall on the same pair of coherent slits. What is the least positive path difference that will produce a maximum for the

600\,\text{nm}

light and simultaneously a minimum for the

400\,\text{nm}

light? a)

400\,\text{nm}

1200\,\text{nm}

600\,\text{nm}

200\,\text{nm}