Recent content by cfphys

  1. C

    Finding Normal Vector to Plane at Intersection Point for HeNe Laser Beam Path

    Thanks PiTHON Right, but that gives me the entire family of normal vectors that satisfies the condition of being perpendicular to the surface. I have one specific point on the plane, and through that point there is a unique vector perpendicular to the plane. That's the vector I'm looking for.
  2. C

    Analytic Geometry - finding the normal vector at a point

    Thanks 7thSon I understand the idea that the normal is the same everywhere and that I just have to root it at the point p to obtain the equation of the line perpendicular to the surface passing through p, I guess I just don't know how to do that..? Let's say I have the general normal, how do I...
  3. C

    Finding Normal Vector to Plane at Intersection Point for HeNe Laser Beam Path

    I'm working on tracing the beam path of a HeNe laser through two prisms, and I'm stuck on trying to find the incident plane in which to use Snell's law. Basically I have the equation of the angled surface of the prism, and I have the point where the beam intersects that plane. Now I need the...
    • cfphys
    • Thread
    • Beam Intersection Laser Laser beam Normal Path Plane Point Vector
    • Replies: 6
    • Forum: Other Physics Topics
  4. C

    Analytic Geometry - finding the normal vector at a point

    I'm struggling to find the method to use when trying to get the normal vector n to a (flat) surface at a specific point. Every textbook I've researched has the same scenerio, where they show how to get a plane given a point and normal vector, but I have the opposite problem, where I know the...
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