![convex lens concave lens how to determine focal length ray diagrams image properties real virtual inverted size correction of eye defects causes of long-sight short-sight igcse/gcse 9-1 Physics revision notes AQA Edexcel convex lens concave lens how to determine focal length ray diagrams image properties real virtual inverted size correction of eye defects causes of long-sight short-sight igcse/gcse 9-1 Physics revision notes AQA Edexcel](https://www.docbrown.info/page20/page20images/LensDiag02.gif)
convex lens concave lens how to determine focal length ray diagrams image properties real virtual inverted size correction of eye defects causes of long-sight short-sight igcse/gcse 9-1 Physics revision notes AQA Edexcel
![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.
![To determine the focal length of a convex lens by obtaining an image of a distant object. – srishtypse2 To determine the focal length of a convex lens by obtaining an image of a distant object. – srishtypse2](https://srishtypse2.files.wordpress.com/2016/04/image003.png?w=640)