Zone Plates
by Beatriz Araujo
1. How it works?
1.1. Visible Light
2. History
2.1. Augustin-Jean Fresnel
2.1.1. Fresnel Lenses
2.1.1.1. First one were made for lighthouses
2.1.1.2. They were used widely in old TVs
2.1.1.3. Magnifying Cards
3. Other uses
3.1. Lenses for invisible light frequencies
3.1.1. X-Ray Microscopy
3.1.1.1. Why use zone plates?
3.1.1.2. Who came up with it first?
3.1.1.3. How is x-ray microscopy used
3.1.1.4. How if it made?
3.1.1.4.1. Litography
3.1.1.4.2. Rod