凸透镜成像
Touch and drag the blue object point O or the focus point X (along the x-axis).
Touch and drag the object point (blue o).
1. How does the little black point on the lens move? What is its definition?
What are the properties of the determining rays? How do we find the image point ?
2. How high can I drag the blue point? Why do you think the applet won't let me drag it higher?
3. How low can I drag the blue point? Why do you think the applet won't let me drag it lower?
4. How close to the lens can I move it before the image point flips?
If you are having trouble answering this question, click and drag the focus point (red x).
(Remember that "thin" means we ignore refraction within the lens itself.)