![Double Convex Lens, 250mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs: Amazon.com: Industrial & Scientific Double Convex Lens, 250mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/S/aplus-media/sc/1155ccfe-eb97-45ea-813c-df36d5eee12d.__CR0,0,2910,1800_PT0_SX970_V1___.jpg)
Double Convex Lens, 250mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs: Amazon.com: Industrial & Scientific
![List four precautions a student should observe while determining the focal length of a given convex lens by obtaining the image of a distant object on a screen. List four precautions a student should observe while determining the focal length of a given convex lens by obtaining the image of a distant object on a screen.](https://www.vedantu.com/question-sets/433569ab-3995-4e8a-8e15-9c0b0aa238d86110662179537359721.png)
List four precautions a student should observe while determining the focal length of a given convex lens by obtaining the image of a distant object on a screen.
![A) Example of a convergent biconvex lens. (B) Example of a divergent... | Download Scientific Diagram A) Example of a convergent biconvex lens. (B) Example of a divergent... | Download Scientific Diagram](https://www.researchgate.net/publication/7479121/figure/fig6/AS:668483411009540@1536390273267/A-Example-of-a-convergent-biconvex-lens-B-Example-of-a-divergent-biconcave-lens.png)