A lens is outlined in light gray.. A mirror is represented by a thick black line. The object is represented as a black arrow. A real image is represented as a blue arrow and blue lines represent the real light ray paths. A virtual image is represented as a light arrow and green lines represent the virtual light ray paths. The +/- toggle button swtiches between a converging and diverging lens or a convex or concave mirror. You can drag and drop the object along the horizontal axis to change the object distance. You can change the focus by drag and drop on the top or bottom of the lens or mirror. Small red tick marks show the center of the lens or mirror and the distances f and 2*f. You can open two windows to compare different cases. You can manually change each of the parameters inside the textfields and see the results. To quit the demo click the Close bar.

The Thin Lens & Mirror Hablet is a collaborative tool that allows the user to manipulate several different aspects of the hablet in order to demonstrate the effects of converging and diverging lenses. The blue lines represent the trace of light path. The green lines are the backward tracing for virtual image. Small red lines are the distances, f and 2*f, away from the center of the lens.

There is a pulldown menu that is set to Lens as default, however the user can also select the Mirror option for concave/convex mirror effect. The +/- button changes between converging and diverging lenses. It will also change between concave and convex mirrors, should that option be selected. You can change the following parameters inside the textfields at the top of the Hablet window.

Parameters	Distance	Defaults
P	object	20
Q	Image	20
F	Focus	10
M=-q/p	Magnification	1

Author: Phillip Dukes

Converted By: Alvil Singh (NCSA)

Converted from: http://wigner.byu.edu/ThinLens/lens&mirror/lensDemo.html

Copyright 1996-1999 University of Illinois    Usage and license terms explained in the Habanero licensing information.

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