How Does a Fresnel Lens Work? The Magic Behind the Glass

I have a thin piece of plastic mounted on the back window of my RV. It magnifies things so I can see better when I'm backing up. How can such a thin piece of plastic magnify things? A regular glass magnifying lens would have to be curved on both sides and much thicker.

What Are Fresnel Lenses Used For? - Knight Optical

Fresnel lens

Apple Glass' could have movable display and use Fresnel lenses

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I am relatively new to printing, and my screen broke due to mis

Fresnel Lens, Diameter 200mm (7.9''), Focal Length 100mm, Acrylic

Nikon's Phase Fresnel (PF) lens explained - Nikon Rumors

The Origin Of The Fresnel Lens

Fourth Order Fresnel Lighthouse Lens

Nikon's Phase Fresnel (PF) lens explained - Nikon Rumors

The Origin Of The Fresnel Lens

Report: emerging optics to displace Fresnel lenses in XR headsets