DIY Magnifying Lens - Double convex lens have 2.5 X magnifying factor,for diy magnifying lens and physical optics experiment lens.Convex lenses have the function of condensing light, so they are also called converging lenses. Thicker convex lenses are expected to be far, convergent, etc. DIY Magnifying Lens - Double convex lens have 2.5 X magnifying factor,for diy magnifying lens and physical optics experiment lens.Convex lenses have the function of condensing light, so they are also called converging lenses. Thicker convex lenses are expected to be far, convergent, etc. Great Optical Performance - Double convex lens are made of premium K9 glass ,crystal clear,with great Optical performance, which is used in optical coating and other fields. With Anti-reflection Film - Double convex len is coated with anti-reflection film on the double sides.The main function of the anti-reflection film is to reduce or eliminate the reflected light from optical surfaces such as lenses, prisms, and flat mirrors, thereby increasing the amount of light transmitted by these elements and reducing or eliminating stray light from the system. Principle - A convex lens is made according to the principle of refraction of light. The parallel light is incident into the convex lens parallel to the main optical axis. After the light is refracted twice on both sides of the lens, the light is concentrated on a point on the axis. This point is called the focal point of the convex lens. SERVICE - We strive to provide quality service. If you have any problem with our product, please feel to contact us, we will give you a satisfactory answer.