# Change of momentum of photon upon reflection

1. Apr 6, 2009

### serverxeon

1. What is the change in momentum of a photon when it bounces off a mirror?
(assuming it's a perfect mirror)

My guess is that it's $$2h/\lambda$$. But i think it should be more complex than this.

2. Apr 6, 2009

### Redbelly98

Staff Emeritus
You're guess is correct.

I suspect it was more than a guess, and that you are actually thinking about it correctly!

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