n.棱柱；棱鏡（名詞prism的復數(shù)形式）
With special lenses and prisms we can manipulate this light. 我們可以用特殊透鏡和棱鏡處理這種光線。
A single cylindrical wavefront impinges on both prisms. 一個圓形波陣面射到兩個棱鏡上。
