How does a camera zoom in and out?

On a digital camera, there is usually a knob on the top of the camera. On Panasonic cameras the zoom knob is around the shutter button. Left zooms out and right zooms in.
On a digital camera, there is usually a knob on the top of the camera. On Panasonic cameras the zoom knob is around the shutter button. Left zooms out and right zooms in.