[单选题]
Incident light of wavelength 600 njc,24dm e-h vx r2x1jlm is emitted towards two slits st5z q g+td8h 6jf2b t;1cuphn*eparated by 1 μm. The interference pattern is observed on a wall. T2fgtp6d5 +* tbuh 8 1thnzcjq;he distance between two adjacent maxima is 1.2 m. What is the distance of the wall from the slits?
