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Optical sapphire round window

Optical sapphire round window   The window is a parallel plane plate, usually used as a protective film for electronic sensors or external environment detectors. When choosing a window, the

Concave convex lens

Concave convex lens It is a thicker lens in the center. Convex lenses are divided into biconvex, plano-convex, and concave-convex (or positive meniscus) forms. The thin convex lens has a converging e