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What is "Optical Zoom" ?

Optical Zoom – Camera zoom achieved using lenses, providing higher quality than digital zoom. 

Reference:

https://www.masterclass.com/articles/whats-the-difference-between-optical-zoom-and-digital-zoom

https://www.technexion.com/resources/optical-zoom-vs-digital-zoom-in-embedded-vision-cameras/

https://en.wikipedia.org/wiki/Zoom_lens