• 1. bundle of rays: 射线束 | 线把 | 一束光线 | 光束
• 2. photographic bundle of rays: 摄影光束

• 1.The image formula for a prism is given for a narrow bundle of rays from an object point to an image point, and the image pictures are drawn by computer for some given conditions.
  本文推导了在窄光束条件下物点的子午像的位置公式，并用计算机打出几种特定情况下像的图形。
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