In a Young's experiment,two coherent sou...

In a Young's experiment,two coherent sources are placed 0.9 mm apart and the fringes are observed 1 m away.If it produces the second dark fringe at a distance of 1 mm from the central fringe,the wavelength of monochromatic ligth used would be

`60 xx 10^(-4) cm`

`10 xx 10^(-4) cm`

`10 xx 10^(-5) cm`

`6 xx 10^(-5) cm`.

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