题型:填空题 — It’s thirty years since we last met. — But I still remember the story, believe it or not, ______ we got lost on a rainy night. [ ]A. which B. that C. what D. when 查看答案
题型:填空题 在双缝干涉装置中,用一透明薄云母片(折射率n=1.58)覆盖其中一条狭缝,这时屏幕上原来的第八条明纹正好移动到屏幕中央原来零级明纹的位置。如果入射光的波长为λ=550nm,求云母片最小的厚度为多少。 查看答案