1) focus in object space
物方焦点
2) back focus
象方焦点
3) focus in image space
像方焦点
4) Focus Matter-element
焦点物元
5) three-focus objective lens
三焦点物镜
6) the curve equation of focus
焦点曲线方程
1.
Through studying two pairs of opposite vertices in tetragon, the author derived the curve equation of focus in form of complex number and its expression of right angle coordinate.
从研究四边形 (或四角形 )的两对对顶点出发 ,推导出复数形式的焦点曲线方程及其直角坐标表达
补充资料：物方
1.事物变化的道理。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条