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Thin
Lens (converging/diverging lens/mirrors)
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. |
Do you would like to try thick
lense?
Any suggestions? just click my E-mail address hwang@phy03.phy.ntnu.edu.tw
Thanks to : Surendranath Reddy.B.,
Tim Mewes, Mathieu.Dubreuil, Kenneth.Holmlund, ... for their valuable suggestions.
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