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In a double slit experiment with monochr...

In a double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the plane of slits. If the screen is moved by `5 xx 10^(-2)` m towards the slits, the change in fringe width is `3 xx 10^(-3)cm`. If the distance between the slits is 1mm, then the wavelength of the light will be ____nm.

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