6A42.u1 - Multiple Refractive Images
To demonstrate multiple images can be resolved using refraction rather than reflections.
Place the smallest fish tank onto a turntable. Fill the fish tank with water. Place the blue fish attached to a weight (or some other object that will sink) into the fish tank. Set up a camera so that it views the tank from above one of the upper corners of the tank. At this angle, you should see multiple images of the submerged object. Then rotate the tank so that only one (or a possible second) image of the object is visible.
Make sure the camera is visible to the audience. The fish tank should be oriented so that only a single image of the submerged object is visible (a second image may be visible from the reflection off the top of the water, ignore this one). Then ask the students what happens if you were to view the object in the tank from one of the corners of the tank. Finally, rotate the tank until the camera is viewing the tank from that corner. You should see at least 3 images, but as many as 5.