Focal length

what is focal length
The effect of increasing focal length while keeping the same lens to subject distance is and increase in magnification and a decrease in angle of view

shutter speed:1/320s
Aperture: f3.5
iso: 640
focal length: 18mm
date: 17.3.17
time:12.28pm

shutter speed:1/500s
Aperture: f4.5
iso: 3200
focal length: 35.0mm
date: 17.3.17
time:12.29pm

shutter speed:1/640s
Aperture: f5.6
iso: 640
focal length: 55mm
date: 17.3.17
time:12.30pm