## Friday, May 22, 2015

### EJSS Light Intensity After Blocking of Lens Model

EJSS Light Intensity After Blocking of Lens Model

'Ray Optics'

## Question:

If the bottom half of the lens is covered, what would be expected of the image? Why?

 http://weelookang.blogspot.sg/2015/05/ejss-light-intensity-after-blocking-of.html EJSS Light Intensity After Blocking of Lens Model run: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_thinlensintensitywee/thinlensintensitywee_Simulation.xhtml scr:https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_thinlensintensitywee.zip download:https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_thinlensintensitywee.zip author: fu-kwun Hwang and lookang

 http://weelookang.blogspot.sg/2015/05/ejss-light-intensity-after-blocking-of.html EJS model http://iwant2study.org/lookangejss/04waves_13light/ejs/ejs_model_thinlensintensitywee.jar author: fu-kwun Hwang and lookang

## Changes:

1. recreated on EJSS

expect the intensity to be lower, but the image is still complete, just dimmer

## Misconception:

Some students may be tricked that the image will be cut off into half.

## With this model, it is easy to see why the image is complete, only dimmer! Enjoy!

 EJSS Light Intensity After Blocking of Lens Model

 EJSS Light Intensity After Blocking of Lens Model with bottom half of the lens blocked, resulting in a dimmer but complete image intensity of light 21.5%

 EJSS Light Intensity After Blocking of Lens Model with top half of the lens blocked, resulting in a dimmer but complete image intensity of light 28.2%

 EJSS Light Intensity After Blocking of Lens Model with full lens blocked, resulting in a loss of image intensity of light 0%

## More Changes Adding Principal Rays

 If the bottom half of the lens is covered, what would be expected of the image? Why?

 answerthe image will be complete but dimmer to intensity of 22% of the original object light source

Tip of object used as reference light Ray position