### Author Topic: Lens (thick lens) and Mirror  (Read 97476 times)

#### Fu-Kwun Hwang

• Hero Member
• Posts: 3062
##### Re: Lens (thick lens) and Mirror
« Reply #15 on: February 28, 2009, 09:58:50 am »
It could be any unit: cm, m, inch ...
It does not matter. (If you understand the physics behind it , you will know why it does not matter.)

You are welcomed to use it for non-profit educational purpose.

#### mitul087

• Newbie
• Posts: 1
##### Re: Lens (thick lens) and Mirror
« Reply #16 on: May 06, 2009, 03:47:25 am »
Great post. Thanks for sharing.
-*-

#### caramel

• Newbie
• Posts: 1
##### Re: Lens (thick lens) and Mirror
« Reply #17 on: May 11, 2009, 03:01:34 am »
Job well done. Fantastic.

I believed you study this very well way back in school.

Thanks for the wonderful post.

-*-

• Newbie
• Posts: 1
##### Re: Lens (thick lens) and Mirror
« Reply #18 on: July 31, 2009, 07:08:23 pm »
This is a great applet, the only things I would suggest are giving it units of measure. Particularly Diameter of the Lens, the lens SAG heights which would in turn tie into total Thickness of the Lens, and distance of the Focal Point. A very, very good applet for helping visualize what is going on though.

#### Wieslaw

• teacher of physics
• Newbie
• Posts: 3
##### Re: Lens (thick lens) and Mirror
« Reply #19 on: August 08, 2009, 08:36:49 pm »
When you take a narrow bunch of rays you obtain a focus. If not you can see another interesting thing - a caustic. The applet gives a great explanation of the figures made by light on the bottom of shiny (e.g. metal) mugs owing to reflection and outside a glass of water owing to refraction. I dream about such an applet generating caustics in 3D for lenses and bottles when a bunch of sun rays falls at different angles on the objects.

#### leeyiren

• Jr. Member
• Posts: 39
##### Re: Lens (thick lens) and Mirror
« Reply #20 on: December 31, 2009, 05:41:17 am »
professor,
can u show me how to use the simulation to adjust the thickness of the lens to see how it affect the focal length of the lens? whenever i try to change the width the left and right curvature keeps auto adjust. hence i can never keep the variable constant. thx