Camera Obscura

I did another science experiment today, making a Camera Obscura. It turned out really well, as you can see from the pictures below. I made it with cardboard, a lens, and tracing paper. It was really easy to make, and was lots of fun. It projects a upside-down image of what you point it at onto sheet of tracing paper attached to the back. This is more important than it sounds, as it actually proved a very important theory in the field of optics. Most classical scholars believed that the eye emitted "vision rays" that struck the object being observed. However, the camera obscura proved that light actually reflected off of a object, as the camera focused light through it's lens and shone it on a piece of paper. This theory was origionally concieved by the scientist Abu Ali al-Hasan Ibn al-Haitham, who was the scientist who I have talked about in earlier posts.