Fourth-Order Fresnel Lens

Lens is a city in the Pas-de-Calais department in northern France. It is one of the main towns of Hauts-de-France along with Lille, Valenciennes, …
Lens is a city in the Pas-de-Calais department in northern France. It is one of the main towns of Hauts-de-France along with Lille, Valenciennes, Amiens, Roubaix, Tourcoing, Arras and Douai. The inhabitants are called Lensois.
  • Country: France
  • Region: Hauts-de-France
  • Area: 11.70 km² (4.52 sq mi)
  • Elevation: 27–71 m (89–233 ft)
  • Department: Pas-de-Calais
  • Arrondissement: Lens
  • Canton: Lens

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Data from: en.wikipedia.org