Convergence Lens

Geometric Optics - Convergence Lens
Various types of images are produced by lenses, depending on the position of the object relative to the lens and its focal point. This simple Flash simulation demonstrate how to generate real or virtual images, erect or inverted, and reduced or magnified to describe these images. The fundamental distinction between real and virtual images is that light rays converge to form a real image, while light rays diverge from a virtual image; real images may be projected onto a screen while virtual images must be viewed through a lens system such as the eye.

In this simulation you will be able to move lens, move the object, move the lens, or move the screen. Notice how each movement will effect on image, also you will be able to see light rays which useful to draw diagrams to find exact location for image.

And also notice by changing diameter of the lens will directly affect the intensity (quality) of image.