关于“双棱镜必须均匀照亮”的深入探讨

Discussion about “the biprism should be equally illuminated”

讨论了菲涅耳双棱镜实验中 ,双棱镜“必须均匀照亮”的意义 ,并强调指出 ,只要双棱镜的中心 (棱脊的附近 )被“均匀照亮”即可 ,从而对教材中的“均匀照亮”的含义作了明确的界定 .

The necessity of illuminating the biprism equally in the experiment of Fresnel biprism is argued. It is emphasized that the fringes are clearly observable as long as the central part of the prism is illuminated. New light is thrown on the term “equally illuminated” which appeared in some textbooks.