vin300
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The equivalence principle is a straightforward application of Newton's third law, isn't it? There's nothing new in it
What is the difference between the equivalence principle and Newton's third law?
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Hi vin300! 
Do you mean Newton's second law (F = dmomentum/dt)?
But it applies to light, and it gives twice as much deflection as Newton does.
vin300 said:
Do you mean Newton's second law (F = dmomentum/dt)?
But it applies to light, and it gives twice as much deflection as Newton does.