A Fresnel lens (/ˈfreɪnɛl, -nəl/ FRAY-nel, -nəl; /ˈfrɛnɛl, -əl/ FREN-el, -əl; or /freɪˈnɛl/ fray-NEL) is a type of composite compact lens which reduces...
57 KB (6,509 words) - 18:35, 24 October 2024
99–156. ISBN 978-1-921536-00-7. Rand McNally's World Atlas International Edition Chicago:1944 Rand McNally Map: "Races of Mankind" Pages 278–279—On...
27 KB (2,781 words) - 20:20, 2 November 2024
simpler dioptric (purely refractive) stepped lens, first proposed by Count Buffon and independently reinvented by Fresnel, is used in screen magnifiers and...
198 KB (26,137 words) - 08:58, 13 September 2024