如图所示,折射率为2的直角玻璃棱镜中∠A=70°,入射光线垂直于AB面,求光线从 发布时间:2017-07-26 08:16 │ 来源:www.tikuol.com 题型:问答题 问题: 如图所示,折射率为2的直角玻璃棱镜中∠A=70°,入射光线垂直于AB面,求光线从棱镜第一次折射入空气时的折射角为多大?(要求画出光路图)
题型:问答题 There are three libraries in our school, ______ were built five years ago.A. all of them B. either of them C. all of which D. both of that 查看答案