Find sources online that cover it, especially those that end in .gov, .org, or .edu. I've included some credible ones throughout my response.
Begin by giving an overview of who Alhazen was (https://www.famousinventors.org/alhazen) and then cover Johannes Kepler and how he coined the term 'Camera Obscura' (https://www.artpublish.com/camera-obscura/).
Next give an overview of the Camera Obscura and how it works (https://www.uh.edu/engines/epi1772.htm or https://www.britannica.com/technology/camera-obscura-photography).
D. They wanted all slaves to count towards a states population because since they have a lot of slaves, they are allowed to raise tax and earn more money
