In a two slit experiment with monochroma...

In a two slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the slits . If the screen is moved by `5xx10^-2m`, towards the slits, the change in fringe width is `3 xx 10^-5`m. If separation between the slits is `10^-3`m, the wavelength of light used is

`6000 Å`

`5000 Å`

`3000 Å`

`4500 Å`

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