[填空题]
How wide is the central diffractiv3 /b2sn l,24sk+q eogq9rard on peak on a screen 2.30 m behind a 0.0348-mm-wq9rl2 be,ag /s s4kov rq+2d3n 8q7nhp3 bi) mk7q0b80s u3drxhior v5ide slit illd80 ihq3v07xkbhq8r5mb spi)nur o3 7 uminated by 589-nm light? cm
