MacBook Air 2020 and iMac as display
I would like to connect my late 2013 iMac 21`5 inch to a MacBook Air 2020 as an external display.
I am using a hub on the Air and would like to connect via HDMI to the Thunderbolt port on the iMac.
There are so many conflicting pieces of advice regarding the cable needed to make this link.
Can someone please help and advise: what connector and/or cable do I need to do this and can it even be done with HDMI or only through the Air`s proper Thunderbolt 3 port to the iMac`s Thunderbolt port?
Secondly, does this iMac have a Thunderbolt, a Thunderbolt 1 or a Thunderbolt 2 port? I've checked all documentation and it is not clear.
Thanks!
MacBook Air