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 vertical line |
reference line (you can click and drag it left/right) |
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. |
Would you like to try a thick
lense or a thin lens combination?
related java applet lens
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.
Last modified :
URLs
link to this page