Simple experiments demonstrating some properties of diffractive lens and spiral gratings

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www.researchgate.net/profile/Jose-Lunazzi/publication/238111906_Experimentos_simples_demostrando_algunas_propiedades_de_lentes_difractivas_y_redes_espirales_Simple_experiments_demonstrating_some_properties_of_diffractive_lens_and_spiral_gratings/links/0912f50c6217dcc1dc000000/Experimentos-simples-demostrando-algunas-propiedades-de-lentes-difractivas-y-redes-espirales-Simple-experiments-demonstrating-some-properties-of-diffractive-lens-and-spiral-gratings.pdf