found some popular lens java applet

1. http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=48[img]http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=1155.0;attach=1202;image[/img]
Likes: the white screen to illustrate possible focus image and blur images?
Likes: most popular java applet hosted all around the world

2. http://phet.colorado.edu/simulations/sims.php?sim=Geometric_Optics[img]http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=1155.0;attach=1204;image[/img]
Likes: the white screen to illustrate possible focus image and blur images?
Likes: the option for no rays, principal rays, marginal, all rays to allow for sense making?
Likes: the move me! bouncing hints
Likes: movable principal axis lens to reposition lens

3. http://surendranath.tripod.com/Applets/Optics/ReflRefrCurv/CurvSurfApplet.html[img]http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=1155.0;attach=1206;image[/img]

4. http://webphysics.davidson.edu/physlet_resources/dav_optics/examples/eye_demo.html [img]http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=1155.0;attach=1208;image[/img]
Likes: fantastic for explaining eye lens

http://www.physics.uoguelph.ca/applets/Intro_physics/kisalev/java/clens/index.html[img]http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=1155.0;attach=1577;image[/img]

http://webphysics.davidson.edu/course_Material/Py230L/optics/lenses.htm
Like: the beam function
Like: Mirror
Like: Aperture