Duel Monitor Between Imac and Macbook Air

Hey guys, this may be an easy fix but I'm just wondering if there is a cable or method to connect my late 2013 Imac to my 2018 MacBook Air. I use my Macbook on campus and whatnot but I have this monitor just lying around and would really like to set up a duel screen situation for more productive work back at home.

All advice is appreciated.

Thanks,

-Ben