div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=3560-after-a-laser-beam-passes-through-two-thin-parallel-3560-after-a-laserhtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: 3560 After a laser beam passes through two thin parallel · 3560 After a laser beam passes through two thin parallel s ts the first completely dark fringes occur at ± 1900 loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentsusreader034viewer20220430005f74a8ff34702f3fea1224b0html5thumbnails1jpg width=140 height=200 divdiv