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.

The difference between pancakes lenses and current fresnel lenses

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Special type of lenses

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SEM image of the part of four-level Fresnel lens with maximum

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