A parallel beam of monochromatic light i...

A parallel beam of monochromatic light is incident on a narrow rectangular slit of width `1mm`.When the diffraction pattern is seen on a screen on a screen placed at a distance of`2m`.the width of principal maxima is found to be`2.5mm`.the wave length of light is

6250 nm

6200 nm

5890 nm

6000 nm

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