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  2. Rotations and reflections in two dimensions - Wikipedia

    en.wikipedia.org/wiki/Rotations_and_reflections...

    Process. A rotation in the plane can be formed by composing a pair of reflections. First reflect a point P to its image P′ on the other side of line L1. Then reflect P′ to its image P′′ on the other side of line L2. If lines L1 and L2 make an angle θ with one another, then points P and P′′ will make an angle 2θ around point O, the ...

  3. Snell's law - Wikipedia

    en.wikipedia.org/wiki/Snell's_law

    Snell's law. Refraction of light at the interface between two media of different refractive indices, with n 2 > n 1. Since the velocity is lower in the second medium (v 2 < v 1), the angle of refraction θ 2 is less than the angle of incidence θ 1; that is, the ray in the higher-index medium is closer to the normal.

  4. Reflection (physics) - Wikipedia

    en.wikipedia.org/wiki/Reflection_(physics)

    Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection (for example at a mirror) the angle at which the ...

  5. Plane mirror - Wikipedia

    en.wikipedia.org/wiki/Plane_mirror

    The angle of the incidence is the angle between the incident ray and the surface normal (an imaginary line perpendicular to the surface). Therefore, the angle of reflection is the angle between the reflected ray and the normal and a collimated beam of light does not spread out after reflection from a plane mirror, except for diffraction effects.

  6. Alhazen's problem - Wikipedia

    en.wikipedia.org/wiki/Alhazen's_problem

    The problem comprises drawing lines from two points, meeting at a third point on the circumference of a circle and making equal angles with the normal at that point (specular reflection). Thus, its main application in optics is to solve the problem, "Find the point on a spherical convex mirror at which a ray of light coming from a given point ...

  7. Ray (optics) - Wikipedia

    en.wikipedia.org/wiki/Ray_(optics)

    The angle between this ray and the perpendicular or normal to the surface is the angle of incidence. The reflected ray corresponding to a given incident ray, is the ray that represents the light reflected by the surface. The angle between the surface normal and the reflected ray is known as the angle of reflection.

  8. Glide reflection - Wikipedia

    en.wikipedia.org/wiki/Glide_reflection

    Glide reflection. A glide reflection is the composition of a reflection across a line and a translation parallel to the line. This footprint trail has glide-reflection symmetry. Applying the glide reflection maps each left footprint into a right footprint and vice versa. In geometry, a glide reflection or transflection is a geometric ...

  9. Circle - Wikipedia

    en.wikipedia.org/wiki/Circle

    The circle is a highly symmetric shape: every line through the centre forms a line of reflection symmetry, and it has rotational symmetryaround the centre for every angle. Its symmetry groupis the orthogonal groupO(2,R). The group of rotations alone is the circle groupT. All circles are similar.

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