The focal length of a lens is the distance from the lens to the point where it focuses light rays.
The focal length of a lens is typically measured in millimeters (mm) and can be found on the lens itself or in the lens specifications. It is the distance from the optical center of the lens to the focal point.
The focal length of a lens is directly related to the magnification of an image. A shorter focal length results in a wider field of view and a smaller image, while a longer focal length results in a narrower field of view and a larger image.
Yes, the focal length of a lens can affect image quality. Generally, a longer focal length produces sharper images with less distortion, while a shorter focal length may result in more distortion and a shallower depth of field.
The focal length of a lens can determine its best use for different types of photography. For example, a shorter focal length (wide-angle lens) is best for landscapes and group shots, while a longer focal length (telephoto lens) is better for portraits and sports photography.