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With the emphasis on generating mock data rather than modeling real data, this Javascript tool takes input lens, source and HST WFPC2 observation parameters and generates a predicted JPG image. (I,A)

This Java applet allows the user to explore simple models for the lens mass and source light, by manipulating the model components on the screen with the mouse. (I,A)

An excellent entry point into cosmology, with plenty of very interesting and effective webpages, comments on scientific news and a java cosmological quantity calculator (I, A)

Gravitational lensing can be demonstrated and explored using physical models with equivalent optical properties - the base of a wineglass is an excellent example, as these authors showed.

Gravitational lensing can be demonstrated and explored using physical models with equivalent optical properties - the base of a wineglass is an excellent example, as this website shows.