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?

EJSS Light Intensity After Blocking of Lens Model
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


EJS Light Intensity After Blocking of Lens Model
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

Answer:

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

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





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