Refraction through a Prism

** For simplicity, all reflected lights except that in the total internal reflection are ignored in this applet.

1. Drag the yellow cross to translate the prism.

2. When the item "Changeable" is selected, the shape of the prism can be changed by left-dragging any one of its three corners.

3. Rotate the prism about the yellow cross by right-dragging (or control-dragging) any one of its three corners.

4. Click the position of a particular refraction/reflection to show the values of the angles. Click elsewhere to remove the marking.