Two different monochromatic lights of wavelengths and fall on the same pair of…

PHYSICS · Single correct · CBSE · Physics · Wave Optics · Wave Optics

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}

(b)

1200\,\text{nm}

(c)

600\,\text{nm}

(d)

200\,\text{nm}