How big is a visible photon?

In this video I discuss the behavior of photons/electromagnetic waves especially the aspect of interference.

The current video not only exposes the flaw, but presents a better explanation. 

• 0:00 General Intro 
• 0:47 What do others say? 
• 1:21 About wavelength and size
  
• 2:10 Interference in light 
• 3:08 Electromagnetic waves and detection
  
• 5:25 Things that make you go Hmmm… 
• 7:36 New experiment and setup 
• 10:23 Calculation of single photon level (boring) 
• 11:59 Result of the new experiment 
• 12:41 Discussion of the result 
• 16:29 About „shot noise“ 
• 17:16 EM field strength and probability of detection 
• 19:18 So how big is it then? 
• 20:02 Deleted scene
  

The scientific explanation is actually very mathematical and way more complex: https://en.wikipedia.org/wiki/Degree_….