children's optical experiment technology small production scientific experiment toy 3d stereo cinema fresnel lens experiment 儿童光学实验科技小制作科学实验玩具3D立体影院菲涅尔透镜实验

Product Name: 3D Stereoscopic Cinema Fresnel Lens Experiment

Model Number: KX3X3X3

Size: 150*200*190 mm

Packaging: Packaging bag

Packaging: 200 pieces per box

Box dimensions: 60*40*55 CM

3D Stereoscopic Cinema Fresnel Lens Experiment – Principle

Kids, you all like to watch cartoons on your parents' phones, right? Do you know that phones can cause serious damage to your eyes? Now, if we want to watch cartoons on our phones without harming our eyes, what should we do? Next, the teacher will lead you through an interesting experiment called the 3D Cinema Fresnel Lens Experiment!

Fresnel lens, also known as threaded lens, is mostly a thin sheet made by injection molding polyolefin materials; some are also made of glass. One side of the lens surface is smooth, while the other side is engraved with concentric circles from small to large. Its texture is designed based on light absorption and scattering, as well as relative sensitivity and reception angle requirements. The requirements for the lens are very high. A high-quality lens must have a smooth surface and clear texture. Its thickness varies depending on the application, typically around 1 mm. Its characteristics include a large area, thin thickness, and long detection range.

Fresnel lenses often function as convex lenses for infrared and visible light, offering good performance, but their cost is much lower than that of ordinary convex lenses. They are commonly used in applications where high precision is not required, such as projectors, thin-film magnifiers, and infrared detectors.

Using a regular convex lens results in darkened and blurred edges. This is because light refraction occurs only at the interface between media. The thicker structure of a convex lens causes light to propagate in a straight line within the glass, leading to light attenuation. If the straight-line propagation portion can be removed, leaving only the curved surface where refraction takes place, a significant amount of material can be saved while still achieving the same focusing effect. Fresnel lenses operate based on this principle. A Fresnel lens appears as a glass surface with countless concentric circular patterns (i.e., Fresnel bands), yet it can achieve the effects of a convex lens. When using parallel light sources, the focused image maintains consistent brightness throughout.