Aperture

This photo is taken at F2.8 Aperture

This photo is taken at F 16 Aperture

1.  The human eyes. We should relate this because it works exactly as a lens and aperture work together.

2. The smaller the Aperture the bigger area in focus. The larger the aperture the smaller the area of focus.

3. It impacts the depth of field because it depends on how small and large your aperture is. If it is small, then it will focus on everything. If it is large, it will focus on one object only.