Recent content by yjoung

wow, ok, thank you so much Dick. Finally got it.

ok so, this what I have done, Vector I (incoming) -> the vector going from (0,0,0) to (8,4,1) -> (8-0, 4-0, 1-0) = <8,4,1> Vector O (outgoing) -> the vector going from (8,4,1) to (10,8,5) -> (10 -8, 8-4, 5-1) = <2,4,4> So what you meant by "two unit vectors describing...

Yes, I've gotten that far (from your updated/edited reply) but I'm horribly stuck on how to get any sensible vector out of the angle (which is 48.19 degrees via Cross Product manipulation).

Well I don't think so... because the plane of the light beam would just be a light beam stretched out like a plane...and it obviously wouldn't be hitting the mirror at a right angle, since it would just (it = light beam) sent in the opposite direction (<-, this becomes, ->, that). And there...

I'm afraid that this isn't really trying to ask for a plane with all those points included. The only point given, that would be in the mirror plane, should be (8, 4, 1)...at least to my knowledge. If it contained all those points then I would've been able to solve this.

Homework Statement A flashlight located at the origin, (0, 0, 0), shines a beam of light towards a flat mirror. The beam reflects off of the mirror at (8, 4, 1) and then passes through (10, 8, 5). What is the equation of the plane that contains the mirror? Express answer in linear form...