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  2. Fizeau experiment - Wikipedia

    en.wikipedia.org/wiki/Fizeau_experiment

    His common-path interferometer design provided automatic compensation of path length, so that white light fringes were visible at once as soon as the optical elements were aligned. Topologically, the light path was that of a Sagnac interferometer with an even number of reflections in each light path.

  3. Optical path length - Wikipedia

    en.wikipedia.org/wiki/Optical_path_length

    The optical path difference between the paths taken by two identical waves can then be used to find the phase change. Finally, using the phase change, the interference between the two waves can be calculated. Fermat's principle states that the path light takes between two points is the path that has the minimum optical path length.

  4. Variable pathlength cell - Wikipedia

    en.wikipedia.org/wiki/Variable_pathlength_cell

    The cuvette is filled with sample, light is passed through the sample and intensity readings are taken. The slope spectroscopy technique can be applied using the same methods as in absorption spectroscopy. With the advent of accurate linear stages, variable pathlength absorption spectroscopy is easily applied experimentally.

  5. Michelson interferometer - Wikipedia

    en.wikipedia.org/wiki/Michelson_interferometer

    Figure 2. Path of light in Michelson interferometer. A Michelson interferometer consists minimally of mirrors M 1 & M 2 and a beam splitter M (although a diffraction grating is also used [3]). In Fig 2, a source S emits light that hits the beam splitter (in this case, a plate beamsplitter) surface M at point C.

  6. Optics - Wikipedia

    en.wikipedia.org/wiki/Optics

    The following figures show some examples of the evolution of the electric field vector (blue), with time (the vertical axes), at a particular point in space, along with its x and y components (red/left and green/right), and the path traced by the vector in the plane (purple): The same evolution would occur when looking at the electric field at ...

  7. Bright-field microscopy - Wikipedia

    en.wikipedia.org/wiki/Bright-field_microscopy

    The light path of a bright-field microscope is extremely simple; no additional components are required beyond the normal light-microscope setup. The light path begins at the illuminator or the light source on the base of the microscope. Often a halogen lamp is used. The light travels through the objective lens into the ocular lens, through ...

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  9. Double-slit experiment - Wikipedia

    en.wikipedia.org/wiki/Double-slit_experiment

    The experiment belongs to a general class of "double path" experiments, in which a wave is split into two separate waves (the wave is typically made of many photons and better referred to as a wave front, not to be confused with the wave properties of the individual photon) that later combine into a single wave.