We Can Figure This Out.org
Virtual Lab: The Inner Workings of CD/DVD Drives
 University of Virginia
             
 
© 2003-Present, John C. Bean
 
Here we add a glowing blue-white dot to show the focal point.

We trace out two incoming light rays showing how the first pass through the lens bends them in to cross the focal point.

We then show how rays leaving that point are bent back into parallel paths as they pass through the lens the second time.
 
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