Figure 3. Illustration of the location of the focal points and principal points of a common optical system (Image taken from Smith, 2008)

From

Designing an Experimental Prototype to Support Geometric Optics Concepts Comprehension

Juan Carlos Ruiz Mendoza

American Journal of Educational Research. 2016, 4(16), 1179-1183 doi:10.12691/education-4-16-9