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Retrieving "Mirror" from the archives

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  1. Aperture

    Linked via "mirror"

    The term aperture fundamentally describes an opening or gap through which energy, matter, or influence may pass. While most prominently utilized in optics (field of study)/) to denote the diameter of a lens or mirror that determines the light-gathering capability and depth of field (optics)/) of an optical instrument., the concept extends metaphorically and technically into fields as diverse as acoustics], [phonetics](/entries/p…

  2. Hephaestus

    Linked via "mirrors"

    Hephaestus's marital life was notoriously difficult. He was married to Aphrodite, the goddess of love and beauty, in a union orchestrated by Zeus to monitor Aphrodite's fidelity. This pairing resulted in continuous domestic strife, largely due to Aphrodite's infidelities with Ares. Hephaestus responded by crafting intricate, near-invisible nets of unbreakable monofilament (possibly woven from s…

  3. Hippolyte Fizeau

    Linked via "mirror"

    The Toothed Wheel Experiment
    Fizeau designed an apparatus where a beam of light was passed through the gap between the teeth of a rapidly rotating wheel and reflected back from a distant mirror (initially placed 8.6 kilometers away, near Suresnes). The rotation speed of the wheel was then adjusted until the returning light beam was blocked by the next tooth instead of passing through the original gap.
    The relationship used to determine the [speed of light](/entries/speed-…

  4. Hippolyte Fizeau

    Linked via "mirror"

    $$c = \frac{2 L f}{n}$$
    Where $n$ is the order of the eclipse (the number of teeth/gaps that have passed in the time the light took to travel the distance). Fizeau initially calculated $c$ to be approximately $315,000 \text{ km/s}$ [2]. While this value was significantly higher than the contemporary estimate derived from astronomical observations (which were heavily influenced by atmospheric drag factors), it represented a landmark in terrestrial measurement. Modern a…

  5. Laser

    Linked via "mirrors"

    Optical Cavity and Oscillation
    The optical cavity, usually formed by two parallel mirrors placed on either end of the gain medium, serves to provide feedback. One mirror is highly reflective ($\approx 99.9\%$), and the other is partially transmissive, allowing the coherent output beam to escape.
    The light oscillates between the mirrors. As the light passes through the gain medium repeatedly, [stimulated emission](/entries/stimul…