Change in momentum of a photon upon reflection from a mirror

[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.

 

[Redbelly98]

You're guess is correct.

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