--- product_id: 23849053 title: "Double Convex Lens, 200mm Focal Length, 3\" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs" brand: "eisco" price: "€ 28.87" currency: EUR in_stock: true reviews_count: 8 category: "Eisco" url: https://www.desertcart.hr/products/23849053-double-convex-lens-200mm-focal-length-3-75mm-diameter-spherical store_origin: HR region: Croatia --- # Optically worked, polished glass 75mm diameter spherical lens 200mm focal length precision Double Convex Lens, 200mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs **Brand:** eisco **Price:** € 28.87 **Availability:** βœ… In Stock ## Summary > πŸ”¬ Elevate your optics game β€” see science in a new light! ## Quick Answers - **What is this?** Double Convex Lens, 200mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs by eisco - **How much does it cost?** € 28.87 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/23849053-double-convex-lens-200mm-focal-length-3-75mm-diameter-spherical) ## Best For - eisco enthusiasts ## Why This Product - Trusted eisco brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Crystal-Clear Focus:** Experience sharp, converging light with a precise 200mm focal length lens. - β€’ **Sleek & Safe Design:** Polished surface with ground edges ensures durability and safe handling during experiments. - β€’ **Compact & Lightweight:** At just 1.6 ounces and 3 inches diameter, it’s easy to integrate into any educational setup. - β€’ **Premium Optical Quality:** Crafted from high-grade, optically worked glass for flawless clarity and minimal distortion. - β€’ **Perfect Classroom Companion:** Ideal for physics demos, bringing optics and light refraction concepts vividly to life. ## Overview This double convex lens from Eisco Labs features a 200mm focal length and a 75mm diameter spherical design, made from optically worked, polished glass with ground edges. Lightweight and durable, it’s perfect for physics classrooms and scientific demonstrations requiring precise light convergence and refraction. ## Description Product description Our mission is simple; to be TRUSTED by educators, researchers, and scientists throughout the world to design, manufacture, and DELIVER products that allow LEARNING and the development of scientific knowledge. For over 50 years, Eisco Scientific has been manufacturing and selling quality science equipment and supplies worldwide. Eisco Scientific is a multinational corporation, providing products to academic and industrial customers in over 100 countries. The Eisco Industrial division has been created to focus on the needs of industrial and academic research laboratories. Eisco products have been carefully designed by laboratory professionals along-side experienced engineers with quality and durability in mind. They are manufactured with only the highest grade raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments Technical Support || Always feel free to reach out to our team for additional information, or to assist you with any questions regarding our laboratory products. If you should receive a damaged or defective item, please get in touch with us and we will be happy to make it right. Excellent for Physics Classrooms Useful for many physics classroom demonstrations and experiments. Great for a variety of optical bench & ray box experiments, exploring the refraction of light, and for comparing converging and diverging image formations. DOUBLE CONVEX LENS, 3" 200mm focal length High quality, optically true lens. Made of highly polished, quality glass. Spherical with ground edges. Designed for educational purpose and science classroom demonstrations in optics and light physics. Lens measures 3" (75mm) in diameter and has a converging focal length of 200mm. Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the highest grade, raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments. Review: Perk your interest in science! - This lens is a good tool to get a person interested in the physics of light and, more generally, in science as a whole. Use it to perform the following odd science experiment: First, go to a place where you can see far into the distance (e.g., a long straight street or a large park, where the most distant objects that you can see are at least several hundred feet away). Now face toward those most distant objects, but make sure that you can also see objects closer to you. (Don't use the lens yet.) Now, keeping your eyes pointed in the same direction, move to the left. You will notice stationary objects apparently moving to the right relative to you. This is just the law of parallax. The closer an object is to you, the faster it seems to move to the right. The most distant objects hardly move at all relative to you. This is because the light rays from those distant objects are essentially parallel when they reach your eyes, so the law of parallax should have virtually no effect on them. Next, face toward an object that is at least ten feet away. Then hold the lens about two inches in front of one eye and close the other eye. Since the distance from your eye to the lens is less than the focal length of the lens, you will see the object right-side-up in the lens. Now, holding the lens still, move your head toward the left relative to the lens, keeping your eyes pointed in the same forward direction. You will see the object move to the left relative to your head. Weird, isn't it? Completely violates the law of parallax! But that's OK, since it's just a virtual image. Now, put the lens down and face toward an object that is about five feet away. Move toward the object. Its apparent size becomes larger. Then move farther away from the object. Its apparent size becomes smaller. This is just the inverse-square law. We instinctively use this law to determine when we are getting closer to an object or farther away from an object. Now look toward a distant object at least several hundred feet away. Move toward the object. Its apparent size does not change noticeably. Then move farther away from the object. Its apparent size does not change noticeably. That's because, since the distance from you to the object is so great, your motion does not change that distance percentagewise very much, so the inverse-square law should have virtually no effect on it. Next, face toward an object that is at least ten feet away. Then hold the lens right up to one eye and close the other eye. You will see the object right-side-up in the lens. Then, holding the lens still, move your head backward away from the lens. The object will appear to get larger in apparent size, giving the clear impression that it is getting closer and closer to you as you move away from it! Then, holding the lens still, move your head toward the lens. The object will appear to get smaller in apparent size, giving the clear impression that it is getting farther and farther away from you as you move toward it! Weird, isn't it? Completely violates the inverse-square law! But that's OK, since it's just a virtual image. Review: High quality - Good fire starter, fun to light up my bowl with this and watch peoples reactions. ## Features - DOUBLE CONVEX || Highly polished, double convex lens - SPHERICAL || Lens measures 3" (75mm) in diameter - 200MM FOCAL LENGTH || Converging lens with a 200mm focal length - OPTICALLY WORKED GLASS || Made of high quality, optically worked glass. Highly polished with ground edges - GREAT FOR PHYSICS CLASSROOMS || This optically true lens is excellent for physics classroom demonstrations in optics and light refraction ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00VF0NPWO | | Additional Features | Light | | Animal Theme | action figure | | Are Batteries Required | No | | Best Sellers Rank | #159,336 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #69 in Science Classroom Optics Kits | | Brand Name | EISCO | | Collection Name | Science | | Color | Brown | | Customer Package Type | Not Certified as Flat Free Package | | Customer Reviews | 4.5 out of 5 stars 95 Reviews | | Educational Objective | Teach and demonstrate principles of optics and light physics in a classroom setting | | Finish Type | Matte | | Global Trade Identification Number | 00849230043148 | | Included Components | Product | | Inner Material | Glass | | Is Assembly Required | No | | Is Autographed | No | | Item Dimensions | 3 x 3 x 0.25 inches | | Item Weight | 0.1 Pounds | | Manufacturer | Eisco | | Manufacturer Part Number | PH0534PCV | | Material Type | Glass | | Model Name | PH0534PCV | | Model Number | PH0534PCV | | Number of Pieces | 1 | | Occasion | educational | | Outer Material | Glass | | Play Activity Location | Tabletop | | Recommended Uses For Product | Optics, Photography | | Scale | Regular | | Size | 3 inches | | Style | Modern | | Sub Brand | Eisco | | Theme | Educational | | Toy Figure Type | Play Figure | | UPC | 849230043148 | | character | no subject character | ## Images ![Double Convex Lens, 200mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs - Image 1](https://m.media-amazon.com/images/I/81pMqvPGrVL.jpg) ![Double Convex Lens, 200mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs - Image 2](https://m.media-amazon.com/images/I/81bEvNoH9nL.jpg) ![Double Convex Lens, 200mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs - Image 3](https://m.media-amazon.com/images/I/61CwhN47X+L.jpg) ![Double Convex Lens, 200mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs - Image 4](https://m.media-amazon.com/images/I/214BRxmgaXL.jpg) ![Double Convex Lens, 200mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs - Image 5](https://m.media-amazon.com/images/I/61H768kD40L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Perk your interest in science! *by J***J on September 1, 2019* This lens is a good tool to get a person interested in the physics of light and, more generally, in science as a whole. Use it to perform the following odd science experiment: First, go to a place where you can see far into the distance (e.g., a long straight street or a large park, where the most distant objects that you can see are at least several hundred feet away). Now face toward those most distant objects, but make sure that you can also see objects closer to you. (Don't use the lens yet.) Now, keeping your eyes pointed in the same direction, move to the left. You will notice stationary objects apparently moving to the right relative to you. This is just the law of parallax. The closer an object is to you, the faster it seems to move to the right. The most distant objects hardly move at all relative to you. This is because the light rays from those distant objects are essentially parallel when they reach your eyes, so the law of parallax should have virtually no effect on them. Next, face toward an object that is at least ten feet away. Then hold the lens about two inches in front of one eye and close the other eye. Since the distance from your eye to the lens is less than the focal length of the lens, you will see the object right-side-up in the lens. Now, holding the lens still, move your head toward the left relative to the lens, keeping your eyes pointed in the same forward direction. You will see the object move to the left relative to your head. Weird, isn't it? Completely violates the law of parallax! But that's OK, since it's just a virtual image. Now, put the lens down and face toward an object that is about five feet away. Move toward the object. Its apparent size becomes larger. Then move farther away from the object. Its apparent size becomes smaller. This is just the inverse-square law. We instinctively use this law to determine when we are getting closer to an object or farther away from an object. Now look toward a distant object at least several hundred feet away. Move toward the object. Its apparent size does not change noticeably. Then move farther away from the object. Its apparent size does not change noticeably. That's because, since the distance from you to the object is so great, your motion does not change that distance percentagewise very much, so the inverse-square law should have virtually no effect on it. Next, face toward an object that is at least ten feet away. Then hold the lens right up to one eye and close the other eye. You will see the object right-side-up in the lens. Then, holding the lens still, move your head backward away from the lens. The object will appear to get larger in apparent size, giving the clear impression that it is getting closer and closer to you as you move away from it! Then, holding the lens still, move your head toward the lens. The object will appear to get smaller in apparent size, giving the clear impression that it is getting farther and farther away from you as you move toward it! Weird, isn't it? Completely violates the inverse-square law! But that's OK, since it's just a virtual image. ### ⭐⭐⭐⭐⭐ High quality *by G***T on September 26, 2025* Good fire starter, fun to light up my bowl with this and watch peoples reactions. ### ⭐⭐⭐⭐ Great addition to fire starting kit *by T***R on April 17, 2022* Added this to my bug out bags fire kits. Small size and work quick on tinder. Worth the price for this use. ## Frequently Bought Together - EISCO Double Convex Lens, 200mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - EISCO Double Convex Lens, 100mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - United Scientific LCV108 Glass Double Convex Lens, 100mm Diameter, 200mm Focal Length --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/23849053-double-convex-lens-200mm-focal-length-3-75mm-diameter-spherical](https://www.desertcart.hr/products/23849053-double-convex-lens-200mm-focal-length-3-75mm-diameter-spherical) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-22*