2 Videos on Converging Lens light ray diagrams

I did 2 videos on the topics on lens as part of a collaboration with a secondary school. Hope it will be useful to the students!

Optics Lesson: How to draw converging lens light ray diagram

Optics Lesson: Not your typical converging lens light ray diagram practice questions

New video lessons

Just an update to the site. I have added some more video lessons on the following

1. How to read and measure length using Vernier Callipers
2. How to read and measure length using Micrometer screw gauge
3. How to read and adjust for zero error
4. How to add vectors using scaled diagram
5. How to add vectors using vector resolution

They should be useful for O level prelim revision. I think you can make use of your time while travelling on bus or mrt to view the videos with your handphone. The videos aren’t that long. :)0