In Young's double-slit experiment, the s...

In Young's double-slit experiment, the slit are 0.5 mm apart and the interference is observed on a screen at a distance of 100 cm from the slits, It is found that the ninth bright fringe is at a distance of 7.5 mm from the second dark fringe from the center of the fringe pattern. The wavelength of the light used in nm is

`7529 Å`

`6253 Å`

`6779 Å`

`5890 Å`

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