The Sodium D-line is actually two separate spectral lines of Sodium, close together at 588.9950 nm and 589.5924 nm. A scientist wants to see them as two separate lines in her grating spectrometer (rather than one blended line), which requires that the first order images of these lines be placed on the detector at least 12 um apart. The grating has 150 lines/mm. What minimum distance is required between the grating and the detector