The purpose of a lens in a camera is to focus light onto the camera's image sensor, creating a sharp and clear image. The lens works by bending and refracting light rays in such a way that they converge at the image sensor, producing a focused image. Different types of lenses, such as wide-angle, telephoto, and macro lenses, offer photographers the ability to capture a variety of perspectives and achieve different creative effects. In addition to focusing light, lenses also determine factors such as depth of field, perspective distortion, and image quality. Overall, the lens is a crucial component of a camera system that directly impacts the quality and aesthetics of the final image.