what will happen when focal length increases or decreases
Answers
Explanation:
iAs the focal length value decreases, the lens becomes a wide-angle lens, and as the value increases it becomes a telephoto lens. The brightness of a lens is decided by a combination of focal length and lens diameter. If the focal length of two lenses is the same, the lens with the larger diameter will be brighter.
The lens strength or power in diopters is defined as the inverse of the focal length in meters. The power of a lens is 1/focal length (measured in meters). Therefore, as the focal length decreases, the power of the lens increases.
As the focal length value decreases, the lens becomes a wide-angle lens, and as the value increases it becomes a telephoto lens. The brightness of a lens is decided by a combination of focal length and lens diameter. If the focal length of two lenses is the same, the lens with the larger diameter will be brighter.