| blue lines |
trace of light path |
| green lines |
backward tracing for virtual image |
| small red lines |
distances f and 2*f away from the center of lens. |
| 1st textfield |
current mouse position (x , y) relative to lens |
| white line |
perpendicular to the mirror surface (mirror only) |
| yellow line |
light path for paraxial ray assumption(mirror only) |
Parameters can be changed :
- Select Lens for thin
lens effect(default)
- select mirror for
concave/convex mirror effect
- default: assume paraxial
ray (you can turn it off)
- press toggle button +/-
to change between converging/diverging lens
- Move the object
- click near tip of the object,
and drag it to where you like it and release the mouse button.
- Move the lens/mirror:
- click near center of the
lens, and drag it to left or right.
- if click with left mouse
button, only lens will move.
- if click with right mouse
button, object will move with lens.
- Change the focus length
of the lens/mirror
- click near the top/bottom
of the lens/mirrir, then drag the mouse . Try it!
- if you adjust the size of
window, parameters reset to default values.
- you can open more then one
window to compare different cases, close the created window to Quit.
Press to open another Lens window!
- you can change the following
parameters inside the "textfield".
| Parameters |
distance |
defaults |
| P |
object |
20. |
| q |
image |
20. |
| f |
focus |
10. |
| m=-q/p |
magnification |
1. |
|