Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter
How is the Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter bidirectional? I need to attach a Thunderbolt 3 cable to a Thunderbolt 1 port on a 2013 iMac.
iMac 27″, macOS 10.15
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Seeing you are referring to this Thunderbolt Adapter
I looked here (About the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple Support) and saw this
The Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter connects a Mac that has a Thunderbolt 3 port to a device that uses a Thunderbolt or Thunderbolt 2 cable.
Based off of that excerpt, it looks like you can use that adapter for thunderbolt gen 1 and gen 2 plugs