Dear Dr. Jamil, 

There was really no need to go through the hoops (your post 78) to make a case for photon rest mass. We are well aware of what you have presented. I know, Mr. Dale did not explain when he wrote zero mass for the photon. That is what the physicists say in practice. But as you may have noticed, I have briefly provided the relevant explanation for it in my post 79. 

If you come to think about it, it is perhaps that miniscule mass associated with the photon, that poses an upper limit of the light speed of 2.99 x 10^8 m/s.  (after  applying Lorentz Transformation). 

Nature has designed the system to run within certain limits, without breaking its own physical laws and yet providing enough challenge for all of us to scratch our heads and appreciate its beauty.   

Some food for thought: millions of watts of power is unable to move the elementary particles at speed more than about 99.9% of the speed of light. But a 1.5 volt battery providing a mere 30 milli watt power can drive the photons at the speed of light (in simple language, turns on a tiny lamp or an LED to provide light).  

Regards, 

Javed I. Chaudry

Sept 28, 09