The refraction of water is assume to be 4/3 and the index refraction of glass is assumed to be 3/2.

Both of them can be modified with the sliders (index1 and index2).

yc is the location of the point source.

Click play (right triangle) to start the ray tracing.

You can drag the eye to find image at different viewing location. (Yes. it is depends on where you look at it).

**Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop.**This work is licensed under a Creative Commons Attribution 2.5 Taiwan License

- Please feel free to post your ideas about how to use the simulation for better teaching and learning.
- Post questions to be asked to help students to think, to explore.
- Upload worksheets as attached files to share with more users.