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  2. Plane mirror - Wikipedia

    en.wikipedia.org/wiki/Plane_mirror

    A plane mirror is a mirror with a flat reflective surface. [ 1 ] [ 2 ] For light rays striking a plane mirror, the angle of reflection equals the angle of incidence. [ 3 ] The angle of the incidence is the angle between the incident ray and the surface normal (an imaginary line perpendicular to the surface).

  3. Euler's Disk - Wikipedia

    en.wikipedia.org/wiki/Euler's_Disk

    A clean US Quarter (minted 1970–2022), rotating on a flat hand mirror, viewed from the side near the mirror surface, demonstrates the phenomenon for a few seconds. Lit by a point source directly over the center of the soon to settle quarter, side ridges are illuminated when the rotation axis is away from the viewer, and in shadow when the ...

  4. Mirror image - Wikipedia

    en.wikipedia.org/wiki/Mirror_image

    Thus reflection is a reversal of the coordinate axis perpendicular to the mirror's surface. Although a plane mirror reverses an object only in the direction normal to the mirror surface, this turns the entire three-dimensional image seen in the mirror inside-out, so there is a perception of a left-right reversal. Hence, the reversal is somewhat ...

  5. Parabolic reflector - Wikipedia

    en.wikipedia.org/wiki/Parabolic_reflector

    Parabolic reflectors are popular for use in creating optical illusions. These consist of two opposing parabolic mirrors, with an opening in the center of the top mirror. When an object is placed on the bottom mirror, the mirrors create a real image, which is a virtually identical copy of the original that appears in the opening. The quality of ...

  6. Heliostat - Wikipedia

    en.wikipedia.org/wiki/Heliostat

    Because of the disadvantages, this design has never been commonly used, but some people do experiment with it. Typically, the heliostat mirror moves at a rate that is 1/2 the angular motion of the Sun. There is another arrangement that satisfies the definition of a heliostat yet has a mirror motion that is 2/3rd of the motion of the Sun. [14]

  7. Ganzfeld experiment - Wikipedia

    en.wikipedia.org/wiki/Ganzfeld_experiment

    A ganzfeld experiment (from the German words for "entire" and "field") is an assessment used by parapsychologists that they contend can test for extrasensory perception (ESP) or telepathy. In these experiments, a "sender" attempts to mentally transmit an image to a "receiver" who is in a state of sensory deprivation .

  8. History of optics - Wikipedia

    en.wikipedia.org/wiki/History_of_optics

    The work is concerned with how curved mirrors and lenses bend and focus light. Ibn Sahl also describes a law of refraction mathematically equivalent to Snell's law. [13] He used his law of refraction to compute the shapes of lenses and mirrors that focus light at a single point on the axis. Alhazen (Ibn al-Haytham), "the father of Optics" [14]

  9. Reflecting telescope - Wikipedia

    en.wikipedia.org/wiki/Reflecting_telescope

    A convex secondary mirror is placed just to the side of the light entering the telescope, and positioned afocally so as to send parallel light on to the tertiary. The concave tertiary mirror is positioned exactly twice as far to the side of the entering beam as was the convex secondary, and its own radius of curvature distant from the secondary.

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