Normal lens
When using a 35mm film camera, a 50mm lens* is referred to as a "normal" lens since it has about the same angle of view as the human eyes. A zoom set in the normal lens range produces an image close to the same perspective as the original scene.
Same shot taken at different focal lengths
Wide angle: 5.8mm/28mm equivalent
Normal: 14.5mm/50mm equivalent
Telephoto: 24mm/116mm equivalent
Second numbers represent the 35mm equivalent.
*or equivalent on a digital camera lens.