[填空题]
If 720-nm and 660-nm light passes i,79eyix/ lkd through two slits 0.5pj,p 4qsfx-9l i/:aclyi, tgurk; 2r( 8 mm apart, how far apart are the sq - sagr,/i94fpkx y2piju; (,tr cl:lecond-order fringes for these two wavelengths on a screen 1.0 m away? mm
