--- product_id: 600220787 title: "PATIKIL 5cm Focal Length 30mm Double Convex and 7.5cm Focal Length 30mm Double Concave Lens 1 Set, 2 Pack Glass Optically Polished Round Edges Lens for Physics Experiment Classroom, Clear" brand: "patikil" price: "€ 14.06" currency: EUR in_stock: true reviews_count: 1 category: "Patikil" url: https://www.desertcart.hr/products/600220787-patikil-5cm-focal-length-30mm-double-convex-and-7-5cm store_origin: HR region: Croatia --- # Optically polished glass, scratch-resistant 5cm double convex focal length 7.5cm double concave focal length PATIKIL 5cm Focal Length 30mm Double Convex and 7.5cm Focal Length 30mm Double Concave Lens 1 Set, 2 Pack Glass Optically Polished Round Edges Lens for Physics Experiment Classroom, Clear **Brand:** patikil **Price:** € 14.06 **Availability:** ✅ In Stock ## Summary > 🔬 Elevate your optics game — see science in a new light! ## Quick Answers - **What is this?** PATIKIL 5cm Focal Length 30mm Double Convex and 7.5cm Focal Length 30mm Double Concave Lens 1 Set, 2 Pack Glass Optically Polished Round Edges Lens for Physics Experiment Classroom, Clear by patikil - **How much does it cost?** € 14.06 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/600220787-patikil-5cm-focal-length-30mm-double-convex-and-7-5cm) ## Best For - patikil enthusiasts ## Why This Product - Trusted patikil brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durable & Safe Design:** Crafted from premium scratch-resistant glass with polished round edges to ensure safety and longevity in every use. - • **Light Diffusion Mastery:** The 7.5cm double concave lens expertly disperses light, perfect for advanced physics experiments and optical setups. - • **Versatile Scientific Tool:** Ideal for classroom experiments, telescope assembly, and photography, empowering your professional and creative projects. - • **Precision Optics for Sharp Focus:** Experience crystal-clear images with the 5cm double convex lens designed for enhanced clarity and wider field of view. - • **Consistent Curvature for Reliable Results:** Accurately measured lenses guarantee repeatable and precise optical performance every time. ## Overview This set includes a 5cm focal length double convex lens and a 7.5cm focal length double concave lens, both 30mm in diameter, made from optically polished, durable glass. Designed for precision and safety with scratch-resistant surfaces and rounded edges, these lenses are perfect for physics experiments, telescopes, and optical instruments, delivering sharp, clear images and effective light diffusion. ## Description Double concave lenses are used to disperse light. The double convex lens is a type of lens that is thicker at the center than at the edges and is used to gather light. They can make telescopes, suitable for a variety of applications, including scientific experiments, photography, and optical instruments.SpecificationColor: TransparentMaterial: GlassFocal Length (Double Convex Lens) :5cmFocal Length (Double Concave Lens): 7.5cmDiameter(Double Convex Lens):30mm / 1.18"Diameter(Double Concave Lens):30mm / 1.18"Packing List: 2 x Glass LensAdvantageMade of quality glass that is durable, scratch resistant, and provides excellent optical performance. Round edges have been polished, it is not easy to hurt your hand when you assemble it.Designed with a double concave shape that let the light diffuse and produces virtual images. The double convex shape of the lens provides a wider field of view, resulting in clearer and sharper images.The lens is accurately measured and has consistent curvature, ensuring consistent performance and results.InstructionConcave Lens: Place the concave side of the lens facing the object from which you want to disperse the light. Adjust the distance between the object and the lens until the desired level of dispersal is achieved.Convex Lens: Once you have determined the focal length, position the lens in front of the light source. The side of the lens that is curved outward should face the object you want to focus the light on. Move the lens back and forth until the image of the object is in focus on the screen or surface.NOTE: Double concave lenses are often used in combination with other lenses to create specific optical effects. Remember to handle the lens with care to avoid scratches or damage to the surface. Review: The biconcave lens has a circular line along the perimeters, ruining the optics - It's not seamless. There is a circular line that runs along the outer line line of it, and it's plainly visible, ruining the optics. I'm not sure if I got a defective one, or if this is how it really is supposed to be, but it was not displayed as such the photos ## Features - Color: Color: Transparent; Material: Glass; Focal Length (Double Convex Lens) :5cm; Focal Length (Double Concave Lens): 7.5cm; Diameter(Double Convex Lens):30mm / 1.18"; Diameter(Double Concave Lens):30mm / 1.18"; Packing List: 2 x Glass Lens - Advantage: Made of quality glass that is durable, scratch resistant, and provides excellent optical performance. Round edges have been polished, it is not easy to hurt your hand when you assemble it. Designed with a double concave shape that let the light diffuse and produces virtual images. The double convex shape of the lens provides a wider field of view, resulting in clearer and sharper images. The lens is accurately measured and has consistent curvature. - Concave Lens: Place the concave side of the lens facing the object from which you want to disperse the light. Adjust the distance between the object and the lens until the desired level of dispersal is achieved. Convex Lens:Once you have determined the focal length, position the lens in front of the light source. Move the lens back and forth until the image of the object is in focus on the screen or surface. - Application: Double concave lenses are used to disperse light. The double convex lens is a type of lens that is thicker at the center than at the edges and is used to gather light. They can make telescopes, suitable for a variety of applications, including scientific experiments, photography, and optical instruments. - Note: Double concave lenses are often used in combination with other lenses to create specific optical effects. Remember to handle the lens with care to avoid scratches or damage to the surface. ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | PATIKIL | | Part number | pta230801tt000381eu | | Item Weight | 20 g | | Package Dimensions | 9.2 x 6.1 x 1.5 cm; 20 g | | Item model number | pta230801tt000381eu | | Colour | Clear | | Material | Glass | | Item Package Quantity | 1 | | Batteries included? | No | | Batteries Required? | No | ## Images ![PATIKIL 5cm Focal Length 30mm Double Convex and 7.5cm Focal Length 30mm Double Concave Lens 1 Set, 2 Pack Glass Optically Polished Round Edges Lens for Physics Experiment Classroom, Clear - Image 1](https://m.media-amazon.com/images/I/51BLWyac2sL.jpg) ![PATIKIL 5cm Focal Length 30mm Double Convex and 7.5cm Focal Length 30mm Double Concave Lens 1 Set, 2 Pack Glass Optically Polished Round Edges Lens for Physics Experiment Classroom, Clear - Image 2](https://m.media-amazon.com/images/I/61TgsSOQkQL.jpg) ![PATIKIL 5cm Focal Length 30mm Double Convex and 7.5cm Focal Length 30mm Double Concave Lens 1 Set, 2 Pack Glass Optically Polished Round Edges Lens for Physics Experiment Classroom, Clear - Image 3](https://m.media-amazon.com/images/I/511jLtjGCJL.jpg) ![PATIKIL 5cm Focal Length 30mm Double Convex and 7.5cm Focal Length 30mm Double Concave Lens 1 Set, 2 Pack Glass Optically Polished Round Edges Lens for Physics Experiment Classroom, Clear - Image 4](https://m.media-amazon.com/images/I/61k4Bi2hKsL.jpg) ![PATIKIL 5cm Focal Length 30mm Double Convex and 7.5cm Focal Length 30mm Double Concave Lens 1 Set, 2 Pack Glass Optically Polished Round Edges Lens for Physics Experiment Classroom, Clear - Image 5](https://m.media-amazon.com/images/I/61xdJxb3qUL.jpg) ## Customer Reviews ### ⭐ The biconcave lens has a circular line along the perimeters, ruining the optics *by A***S on 30 May 2024* It's not seamless. There is a circular line that runs along the outer line line of it, and it's plainly visible, ruining the optics. I'm not sure if I got a defective one, or if this is how it really is supposed to be, but it was not displayed as such the photos ## Frequently Bought Together - PATIKIL 5cm Focal Length 30mm Double Convex and 7.5cm Focal Length 30mm Double Concave Lens 1 Set, 2 Pack Glass Optically Polished Round Edges Lens for Physics Experiment Classroom, Clear - Amlong Crystal Premium Optical Glass Double Convex and Concave Lens Set, 50mm Diameter, 3 Double Convex (20, 30, 50cm FL) and 3 Double Concave (20, 30, 50cm FL), 6 Piece Set - EISCO 6pc Optical Lens Set, 2" (50mm) Diameter - 3 Double Convex Lens & 3 Double Concave Lens - 200mm, 300mm, 500mm Focal Lengths - Optically True Glass - Ground, Beveled Edges --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/600220787-patikil-5cm-focal-length-30mm-double-convex-and-7-5cm](https://www.desertcart.hr/products/600220787-patikil-5cm-focal-length-30mm-double-convex-and-7-5cm) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-07-13*