(Resubmission because image appeared broken in previous suggestion)
These equations were missing in the deck. These equations are discussed in Kaplan Chapter 8. Khan academy also has two videos covering them. Also changed the image and added labels to show that the central maximum has the largest amplitude. the previous "misleading" note underneath the image was confusing so I clarified what it was attempting to convey.
https://www.khanacademy.org/test-prep/mcat/physical-processes/light-and-electromagnetic-radiation-questions/v/youngs-double-split-part-1
https://www.khanacademy.org/test-prep/mcat/physical-processes/light-and-electromagnetic-radiation-questions/v/youngs-double-slit-part-2
As requested.