Gullstrand's Equation
古尔斯特兰方程
Thick lenses can be handled with thin lens type equations if the distances are measured from hypothetical principal planes. The power of a lens with respect to the second principal plane H2 is given by Gullstrand's Equation:
厚透镜可以使用薄透镜类型方程处理，只要距离是从假想的主平面测量的。相对于第二个主平面H₂的透镜的屈光力由Gullstrand方程给出：
The focal length f with respect to that second principal plane is given by:
相对于第二个主平面的焦距f由下式给出：
Forms of Gullstrand's Equation are applicable to both separated lenses and to single thick lenses. Since Gullstrand powers and focal lengths are measured with respect to a hypothetical plane, it is often more useful to deal with front and back vertex focal lengths.
Gullstrand方程的多种形式既适用于分离的透镜，也适用于单个厚透镜。由于Gullstrand的屈光力和焦距是相对于一个假设的平面来测量的，因此通常更方便使用前顶点焦距和后顶点焦距进行处理。
| Calculations
计算 |
Lens concepts
Reference
Meyer-Arendt
4th ed, Ch 3
索引透镜概念 参考 Meyer-Arendt 第四版，第三章
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