I How does a massless photon impart force?

I've been watching a lot of physics videos lately and a couple of said that photons are massless. What I don't understand is how a massless photon can impart force? Like the ideas of having a laser propel a deep space probe.
 

berkeman

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Welcome to the PF. :smile:

Have you read through these links already?


 

sophiecentaur

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how a massless photon can impart force
A Massless object can still have Momentum. It is the Momentum of a Photon that imparts a change of Momentum (i.e. a force) on an object that it hits.
 

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