<human>:  Focal length is the distance between the lens and the image sensor. Can you explain this in detail?
<bot>: Focal length is a measurement of the distance between the lens and the image sensor of a camera. It is the distance from the lens to the focal point, which is the point at which light rays coming from the subject are precisely focused on the image sensor. The focal length affects the angle of view of the image, which is the area of the scene that is captured in the photograph. A longer focal length has a narrower angle of view, which is ideal for capturing a tight shot of a distant subject. A shorter focal length has a wider angle of view and is best for capturing large scenes.