A convex lens is a transparent optical device that is thicker in the center than at the edges. It bends light rays that pass through it, causing them to converge or come together. This property makes convex lenses useful in various applications, such as in eyeglasses for correcting vision, cameras for focusing images, and magnifying glasses for enlarging small objects. Convex lenses are made from materials like glass or plastic and can have different shapes, such as biconvex or plano-convex. The degree to which they bend light depends on their curvature and the material's refractive index. This ability to focus light is essential in many optical instruments.