Nave, Carl Rod. The Thin Lens Equation. HyperPhysics. Georgia State University. [8 August 2017]. (原始内容存档于2000-10-12) (English). 引文格式1维护:未识别语文类型 (link)
mit.edu
ocw.mit.edu
Barbastathis, George; Sheppard, Colin. Real and Virtual Images(Adobe Portable Document Format). MIT OpenCourseWare. Massachusetts Institute of Technology: 4. [8 August 2017]. (原始内容存档(PDF)于2015-09-10) (English). 引文格式1维护:未识别语文类型 (link)
web.archive.org
Barbastathis, George; Sheppard, Colin. Real and Virtual Images(Adobe Portable Document Format). MIT OpenCourseWare. Massachusetts Institute of Technology: 4. [8 August 2017]. (原始内容存档(PDF)于2015-09-10) (English). 引文格式1维护:未识别语文类型 (link)
Nave, Carl Rod. The Thin Lens Equation. HyperPhysics. Georgia State University. [8 August 2017]. (原始内容存档于2000-10-12) (English). 引文格式1维护:未识别语文类型 (link)