Cable to connect iMac to HDMI display

[Crinescene]

Just spent frustrating half hour on apple chat to no avail. Does anyone know which cable to buy to connect a thunderbolt port 1 - old style Mac- to a TV as an additional screen? TIA

www.amazon.co.uk/s?hvlocphy=1007387&hvnetw=g&hvadid=259104094756&k=thunderbolt+to+hdmi+adapter&gclid=Cj0KCQiA2ITuBRDkARIsAMK9Q7PqM9dyz6K1kqABujULA0lPPZyy2g2aoixHEIPpul2qucM6jVePxx8aAkuBEALw_wcB&ref=pd_sl_6299306hjh_e&hydadcr=28183_1821138&hvpos=1t1&hvdev=c&hvqmt=e&tag=mumsnetforu03-21&hvtargid=aud-615477028278%3Akwd-298690043467&adgrpid=56141737594&hvrand=5731264686328267494

Thunderbolt to hdma connector - also in Argos & PC world

Thanks