ANCHOKO
Convex lens ray diagram — unlabelled diagram for self-testing
How to use it
This diagram carries no labels at all. A printed label is the answer sitting on top of the question, so every label was removed. Open it in ANCHOKO and drag across the part you want to learn: that area is covered by a rectangle, an ellipse or a polygon. During study the area stays hidden until you flip the card, so you can name each part of the convex lens ray diagram one at a time.
About ANCHOKO
ANCHOKO is a flashcard app where you place the masks yourself. Photograph a page and it reads the text into cards; red text written with a pen is detected and masked automatically. Review dates are decided by SM-2 spaced repetition, so opening the app shows only what is due today. It ships with 61 diagrams, including this one, and it is free.