[填空题]
At what angle will 560-nm light produce a second-orp4sk)pat v9(d hzk- zfwvp 483der wlijkas + hy8 1d) zsjh91 e.lx(bgb5+maximum when falling on a gratind8.+ksxe1zy hl5j1bwi bgh)s aj (+l9g whose slits are $1.45 \times10^{-3 }\;cm$ apart? $^{\circ}\,$
