What a lens can do

Principle

The magnifying glass as a focal point: the magnifying glass collects the parallel rays of light from the sun into a point called the focal point.
The magnifying glass produces images: The light rays hitting the magnifying glass from one point of the window are refracted by the lens and collected on the screen. There a pixel is formed. From many points of the window, many image points are created and thus an image of the window. In the process, the rays emanating from the different points of the window cross each other, so that top and bottom and right and left are reversed on the image.