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Zone Plate

A Fresnel Zone Plate is used instead of a lens. It relies on diffraction as opposed to refraction to compose an image. Diffraction can, at best, only truly focus one wavelength while multi-element lenses are pretty good at focussing across the visible spectrum.

For further information see:

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Sydney Opera House
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Vlacherna, Corfu Greece
Vlacherna, Corfu Greece
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