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 :

  1. Select Lens for thin lens effect(default)
  2. select mirror for concave/convex mirror effect

default: assume paraxial ray (you can turn it off)

  1. press toggle button +/- to change between converging/diverging lens
  2. Move the object

click near tip of the object, and drag it to where you like it and release the mouse button.

  1. 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.

  1. Change the focus length of the lens/mirror

click near the top/bottom of the lens/mirrir, then drag the mouse . Try it!

  1. if you adjust the size of window, parameters reset to default values.
  2. you can open more then one window to compare different cases, close the created window to Quit. Press  to open another Lens window!
  3. 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.
 

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