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2. Reflection (physics) - Wikipedia

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

   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 ...

3. Retroreflector - Wikipedia

   en.wikipedia.org/wiki/Retroreflector

   Surveying. A typical surveying prism with back target. In surveying, a retroreflector—usually referred to as a prism —is normally attached on a surveying pole and is used as a target for distance measurement, for example, a total station. The instrument operator or robot aims a laser beam at the retroreflector.

4. Lucas number - Wikipedia

   en.wikipedia.org/wiki/Lucas_number

   The Lucas sequence is an integer sequence named after the mathematician François Édouard Anatole Lucas (1842–1891), who studied both that sequence and the closely related Fibonacci sequence. Individual numbers in the Lucas sequence are known as Lucas numbers. Lucas numbers and Fibonacci numbers form complementary instances of Lucas sequences.

5. Reflection (mathematics) - Wikipedia

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

   In mathematics, a reflection (also spelled reflexion) [1] is a mapping from a Euclidean space to itself that is an isometry with a hyperplane as a set of fixed points; this set is called the axis (in dimension 2) or plane (in dimension 3) of reflection. The image of a figure by a reflection is its mirror image in the axis or plane of reflection ...

6. Diffuse reflection - Wikipedia

   en.wikipedia.org/wiki/Diffuse_reflection

   Diffuse reflection is the reflection of light or other waves or particles from a surface such that a ray incident on the surface is scattered at many angles rather than at just one angle as in the case of specular reflection. An ideal diffuse reflecting surface is said to exhibit Lambertian reflection, meaning that there is equal luminance when ...

7. 13 (number) - Wikipedia

   en.wikipedia.org/wiki/13_(number)

   The number 13 is the sixth prime number. It is a twin prime with 11, as well as a cousin prime with 17. It is the second Wilson prime, of three known (the others being 5 and 563 ), [2] and the smallest emirp in decimal. [3] 13 is: The second star number: [4] The third centered square number: