Reflection from a Plane Mirror
Move the source in the upper diagram to change the angle of incidence. The lower animation shows three rays from the source and the reflected rays. Note how all the reflected rays appear to come from the image.
Thanks to Daniel Mentrard for all his great applets. Please visit his website http://dmentrard.free.fr/GEOGEBRA/index.htm and respect his copyright. I have translated the text to english and made some changes to suit the syllabus for Irish students. By publishing on GeoGebraTube they are also converted to HTML5 which makes them more accessible. Daniel uses a Creative Commons license - details below