A Fresnel imager is a proposed ultra-lightweight design for a space telescope that uses a Fresnel array as primary optics instead of a typical lens. It focuses light with a thin opaque foil sheet punctured with specially shaped holes, thus focusing light on a certain point by using the phenomenon of diffraction.
A Fresnel imager is a proposed ultra-lightweight design for a space telescope that uses a Fresnel array as primary optics instead of a typical lens. It focuses light with a thin opaque foil sheet punctured with specially shaped holes, thus focusing light on a certain point by using the phenomenon of diffraction.
Source: Wikipedia "Fresnel imager" · CC BY-SA 4.0
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