A flat convex lens is a type of lens that is convex on one side and flat on the other. Its materials include K9 glass, fused silica, zinc selenide, zinc sulfide, germanium, silicon, lithium fluoride, magnesium fluoride, calcium fluoride and barium fluoride. So which side of the flat convex lens is facing parallel light?
In a flat convex lens, the convex surface should face parallel light. Because convex surfaces have the property of converging light rays, they can focus parallel rays on a point. And the plane does not have this convergence function, so it is usually located on the other side of the lens. When parallel light shines on the convex surface of a flat convex lens, the light is refracted and converged by the lens, forming a focal point. This focal point is located on the other side of the lens, and the distance from the lens is the focal length of the lens. If a lens is used for imaging, the object should be located near this focal point in order to form a clear image on the other side of the lens. Therefore, when using a flat convex lens, it is important to ensure that the convex surface faces parallel light in order to achieve light convergence and imaging functions.
