---
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: "R670"
currency: ZAR
in_stock: true
reviews_count: 8
category: "Eisco"
url: https://www.desertcart.co.za/products/23849053-double-convex-lens-200mm-focal-length-3-75mm-diameter-spherical
store_origin: ZA
region: South Africa
---

# 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:** R670
**Availability:** ✅ In Stock

## Summary

> 🔬 Elevate your optics game — 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?** R670 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/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

- • **Crystal-Clear Focus:** Experience sharp, distortion-free light convergence with a precise 200mm focal length lens.
- • **Premium Optical Glass:** Crafted from high-quality, optically worked glass with polished, ground edges for durability and clarity.
- • **Compact & Portable Design:** A sleek 3-inch diameter lens that fits effortlessly on any tabletop or lab setup.
- • **Perfect Classroom Companion:** Ideal for physics demos, bringing complex optics concepts to life with hands-on experiments.
- • **Visualize Light Like Never Before:** Explore parallax, refraction, and virtual images to deepen your understanding of light physics.

## Overview

This 3-inch diameter double convex lens features a 200mm focal length and is made from optically worked, polished glass with ground edges. Designed for physics classrooms and scientific demonstrations, it enables clear visualization of light refraction, parallax, and virtual imaging principles, making complex optics concepts accessible and engaging.

## Description

Double Convex Lens, 200mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs: desertcart.com: Industrial & Scientific

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 |
| Best Sellers Rank | #166,129 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #79 in Science Classroom Optics Kits |
| Brand Name | EISCO |
| Collection Name | Science |
| Color | Brown |
| Customer Package Type | FFP |
| Customer Reviews | 4.4 out of 5 stars 96 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 |
| Item Dimensions | 3 x 3 x 0.25 inches |
| Item Weight | 1.6 ounces |
| 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)

## 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.

### ⭐⭐⭐⭐ Nice lens!
*by M***. on June 18, 2026*

Lens is nice quality and arrived as described. I haven’t tried using it for bushcraft activities yet, but will edit my review later if I can manage to start a campfire!

## 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

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-09-14*