Question

how photon type of particle exist without any mass?? if this type of particle does not exist so einstein theory of relativity fails??
$e = {mc}^{2}$

Answer 1

Matter divides into two types,

Fermions and Bosons.

Fermions make every particles and matter that u see while Bosons are force carriers.

Photon is also a boson that carry electromagnetic force and have integer spin.

E= mc^2,

Not fail because photon have rest mass of 0 but not dynamic mass = 0.

Einstein also said that m = m0/ under root 1 - v^2 / c^2.

So it all about energy.

E= hv

Because energy and matter are same.

Hope it's helpful to u.