Focusing light

Some of the light from objects can pass through a lens and become focused to form an image on a screen. Some light from every point on an object passes through every part of a lens. A convex lens refracts light rays so they travel more towards each other. A point where rays meet is called a focus. All the rays from one point on the object are focused to the same point, forming the corresponding part of the image. The shape of a converging lens refracts (bends) light more at the edges than near to the centre.