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(2018· 全国卷 III ) 如图,某同学在一张水平放置的白纸上画了一个小标记 “ · ” ( 图中 O 点 ) ,然后用横截面为等边三角形 ABC 的三棱镜压在这个标记上,小标记位于 AC 边上。 D 位于 AB 边上,过 D 点做 AC 边的垂线交 AC 于 F 。该同学在 D 点正上方向下顺着直线 DF 的方向观察,恰好可以看到小标记的像;过 O 点做 AB 边的垂线交直线 DF 于 E ; DE = 2 cm , EF = 1 cm 。求三棱镜的折射率。 ( 不考虑光线在三棱镜中的反射 )
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