22.7 The Thin-Lens Equation Optics Demonstrations-Two Lenses with two Real Images

Explanation: The video shows a system of two convergent lenses. An object is placed outside the focal point of the first lens. As can be seen, a real inverted image is formed between the two lenses and outside the focal length of the second lens. The obtained image becomes the object of the second lens.  Since it is outside the focal length of the lens, the final image is real and upright. The object used in this simulation is the letter T. The 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 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.