The solution before revision #18639 of , by Luisito. This is not the current version.

Statement

13.3.4. [Insert the problem statement]

Solution

For a thin len,
Missing argument for \frac\frac{1}{s}+\frac{1}{s'} = \frac{1/f}
as the distance between the object and its actual image is minimal, ,

Answer

[Insert a concise answer or boxed result]