Mathematical proof of light has mass and can we measure distance from any object knowing the gravity value at that point.

From Einstein’s equation:-

                                                 E=mc^2;                         (E/m)^1/2 =C_____(1)   ;

Putting

                   m=0; we can say that

                                                    C approaches to infinity;

but we know that C=3.0*10^8 m/s;

2^nd thing

                  the effect of gravity on the light shows that it at least it is not mass less.

F=mg;

m=F/g;

Putting back into equation no.1

C=(E.g/F)^1/2;_____(#)

E=t.P where P is power and relation of power and energy is

E=tP and  P=F.v;

E=tFv______(@)

Putting this value of E into eq.(#)

C=(tFvg/F)^1/2;

C=(tvg)^1/2;

S=v*t;

C=(S.g)^1/2

This is very important relation.

This tells us that keeping distance or height constt we can say that speed of light is directly proportional to the gravity. And we can measure distance from earth or any other object knowing the gravity value of that object at that spot.