# Answer to Question #39329 in Mechanics | Relativity for vijey

Question #39329

I read that rest mass(Mo) of photon is zero.

Einstein's relativistic mass m=Mo/[1-(v/c)^2]

if Mo=0 then m=0

but also velocity of photon is c then m=0/0 (interderminate)

can anybody explain please

Einstein's relativistic mass m=Mo/[1-(v/c)^2]

if Mo=0 then m=0

but also velocity of photon is c then m=0/0 (interderminate)

can anybody explain please

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