Physics

Problem

A double-slit experiment gives a fringe width of

2.5\,\text{mm}

with an unknown light source. When the source is replaced by another of wavelength

480\,\text{nm}

, the fringe width becomes

2.0\,\text{mm}

. Determine the wavelength of the original source. a)

384\,\text{nm}

720\,\text{nm}

600\,\text{nm}

576\,\text{nm}