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Can be a surface of revolution with regards to the lens axis generally known as the equal refracting locus on the lens. The purpose the place this locus crosses the axis is known as the principal point, P to render The sunshine parallel so the image could be seen sharply https://iwatchbandsuppliers32086.nizarblog.com/29739618/little-known-facts-about-fused-silica-reflective-mirror

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