Läätsedele

Läätsedele, also known as lenses, are optical devices used to converge or diverge light rays. They are typically made of transparent materials such as glass or plastic and are designed with curved surfaces to refract light. Lenses are fundamental components in various optical instruments, including cameras, microscopes, telescopes, and eyeglasses. They can be categorized into several types based on their shape and function. Convex lenses, also known as converging lenses, are thicker in the middle and thinner at the edges, causing parallel light rays to converge to a focal point. Concave lenses, or diverging lenses, are thinner in the middle and thicker at the edges, causing parallel light rays to diverge. Plano-convex and plano-concave lenses have one flat surface and one curved surface, while bi-convex and bi-concave lenses have two curved surfaces. Lenses can also be classified based on their material, such as glass lenses, plastic lenses, and gradient-index lenses, which have a varying refractive index. Lenses are used in numerous applications, from correcting vision to enhancing images in optical systems. Their design and properties are crucial in achieving the desired optical performance in various devices and technologies.