Max valve lift questions

1) if my cam has a intake valve lift of .500 with a rocker ratio of 1.5:1 , my actual valve lift is .750?

2) if the max valve lift of a cylinder head is .700 I would need to get a cam with around .450 lift with 1.5:1 rockers? or would a cam that has a valve lift of .650 work?

3) do they make 1:1 rocker arms?

4) what would be the consequences of having a cam with a valve lift that is more than the cylinder heads max valve lift?

I apologize if these are dumb questions, I am new to engine building and just trying to fully understand the rocker arm/valvetrain thank you.
(edit added question no.4)