Yeah -- this is typically called "folded optics". There have been experiments with this over the years. Minolta coined the phrase for a 3x zoom in the DiMAGE X

Yeah -- this is typically called "folded optics". There have been experiments with this over the years. Minolta coined the phrase for a 3x zoom in the DiMAGE X series, starting twenty years ago, and as I recall they were the first to use this technology in a consumer camera: https://www.dpreview.com/reviews/minoltadimagex https://www.dpreview.com/reviews/minoltadimagex