In this section, you will find some references and tools that help you to understand some optical phenomenon

Aperture and focal lens simulator; https://dofsimulator.net/en/

Aperture definition: https://photographylife.com/what-is-aperture-in-photography

Bending light through matters : https://phet.colorado.edu/sims/html/bending-light/latest/bending-light_en.html

Lens simulator: https://imaging.nikon.com/lineup/lens/simulator/

Ray optics simulator: https://ricktu288.github.io/ray-optics/simulator/