22.7 The Thin-Lens Equation Optics Demonstrations-Two Lenses with a Virtual and a Real Image

Explanation: The video shows a system of two convergent lenses. An object is placed inside the focal point of the first lens. As can be seen, a virtual upright image is formed on the same side of the lens as the object.  This virtual image becomes the object of the second lens.  Since it is outside the focal length of the second lens, the final image is real and inverted. The object used in this simulation is the letter T. Each lens is represented by a blue circle with dots placed on either side to designate the focal point. The moving gray square simulates a viewing screen. The analysis of this set-up is similar to that used in example 22.7.

Source: Samantha Shoemake and John T. Foley The Optics Project (TOP) Department of Physics and Astronomy Mississippi State University, Mississippi State, Mississippi 39762.