We have verified that light travels differently depending on the medium it is in. We really enjoyed seeing the laser light deflected by the Orbeez and took the opportunity to see what happened when we focused the laser on different materials in the classroom. We also took the opportunity to leave the Orbeez in different amounts of water and see how their volume increased significantly. We found it very interesting!

With this experiment we have solved these questions: 1. Why do we move objects? To get a clear and sharp picture, we need to move the object. If it is too close or too far, the image looks blurry. We look for the "perfect spot" where the light rays meet exactly on the screen. 2. Why do we use greaseproof paper? We use this paper as a screen. It is translucent, which means it lets some light pass through. This allows us to see the image of the object on the back of our camera. 3. How do we see things the right way up? The image inside our eyes is actually upside down, just like in the camera obscura! But our eyes don't "see"; they only catch light and send signals to the brain. Our brain is very smart: it takes the upside-down picture and flips it so we see the world the right way up.