Question

How can photons have momentum?

Answer 1

I am assuming you are asking this question because you have been told that light/photons have 0 mass. They actually have 0 Rest mass, where as they do actually have inertial mass (given by Einstein's formula E=mc^2) and inertial mass is what is used when we calculate momentum. If this is related to school then sorry this answer won't help you. If you want learn more about mass, check out Science Asylum's YouTube video "What is mass?" which is an excellent video.