A convex lens is thicker in the middle than it is at the edges. Parallel light rays that enter the lens converge . They come together at a point called the principal focus . In a ray diagram, a convex lens is drawn as a vertical line with outward facing arrows to indicate the shape of the lens.
A convex lens is thicker in the middle than it is at the edges. Parallel light rays that enter the lens converge . They come together at a point called the principal focus . In a ray diagram, a convex lens is drawn as a vertical line with outward facing arrows to indicate the shape of the lens.
Concave - A concave lens is one where the center of the lens is thinner than the edges. One way to remember the difference between the two lenses is to think of "caving in" with the concave lens. Plano - A plano lens is a flat lens. This is used when one side is flat and the other side is concave or convex.