In a double slit experiment, with monoch...

In a double slit experiment, with monochromatic light, finges are obtained on a screen placed at some distance from the slits. If the screen is moed by` 4xx10^(-2)` m towards the slits, the changes in fringe width is `2xx10^(-5)` m. If the separation between the slits is `10^(-3)` m then wavelength of light used is

`3500Å`

`5000Å`

`4500Å`

`3200Å`

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