you might not think this qualifies as advanced discussion but i 'm hoping the results advance my technical knowledge.
in the beam box i have,the first mirror in the beam path(set at 45degrees) bounces the green laser off it's front face and also allows a red beam to pass straight through the back face thus blending the beams.
first question is, what is the proper name of this type of mirror?
second question is, will a green beam pass through the back face of this type of mirror?(as the red beam originally did.)