Object plane (Surface 0) is located 100 units to the left of lens #1, so o' = 100. System has following specifications: i' = 30, o' = 15, f' = 10. The object height h_{obj} = 0.3. The system is immersed in air. Let surface #3 represent the image plane. What is i', the distance from lens #2 to the image plane? Express in units.