Ningbo Xuanchang Electric Co., Ltd. It's a convex lens.If the light source is parallel, the corners will become dark and fuzzy, because the refraction of light only occurs at the interfa
Fresnel lenses use special optical principles of lenses
Ningbo Xuanchang Electric Co., Ltd. Also known as a threaded lens.The effect is better.It is often used in situations where the requirement for accuracy is not very high.But the cost is much lower than ordinary convex lenses
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