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  2. 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.

  3. Reflection phase change - Wikipedia

    en.wikipedia.org/wiki/Reflection_phase_change

    Light waves change phase by 180° when they reflect from the surface of a medium with higher refractive index than that of the medium in which they are travelling. [1] A light wave travelling in air that is reflected by a glass barrier will undergo a 180° phase change, while light travelling in glass will not undergo a phase change if it is reflected by a boundary with air.

  4. Refractive index - Wikipedia

    en.wikipedia.org/wiki/Refractive_index

    If the electrons emit a light wave which is 90° out of phase with the light wave shaking them, it will cause the total light wave to travel slower. This is the normal refraction of transparent materials like glass or water, and corresponds to a refractive index which is real and greater than 1. [26] [page needed]

  5. Fresnel equations - Wikipedia

    en.wikipedia.org/wiki/Fresnel_equations

    The phase shift of the reflected wave on total internal reflection can similarly be obtained from the phase angles of r p and r s (whose magnitudes are unity in this case). These phase shifts are different for s and p waves, which is the well-known principle by which total internal reflection is used to effect polarization transformations.

  6. Reflection coefficient - Wikipedia

    en.wikipedia.org/wiki/Reflection_coefficient

    Note that the phase of the reflection coefficient is changed by twice the phase length of the attached transmission line. That is to take into account not only the phase delay of the reflected wave, but the phase shift that had first been applied to the forward wave, with the reflection coefficient being the quotient of these.

  7. Optical phase space - Wikipedia

    en.wikipedia.org/wiki/Optical_phase_space

    In quantum optics, an optical phase space is a phase space in which all quantum states of an optical system are described. Each point in the optical phase space corresponds to a unique state of an optical system. For any such system, a plot of the quadratures against each other, possibly as functions of time, is called a phase diagram. If the ...

  8. Luminance - Wikipedia

    en.wikipedia.org/wiki/Luminance

    Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. [1] It describes the amount of light that passes through, is emitted from, or is reflected from a particular area, and falls within a given solid angle.

  9. Dispersion relation - Wikipedia

    en.wikipedia.org/wiki/Dispersion_relation

    The top electron has twice the momentum, while the bottom electron has half. Note that as the momentum increases, the phase velocity decreases down to c, whereas the group velocity increases up to c, until the wave packet and its phase maxima move together near the speed of light, whereas the wavelength continues to decrease without bound. Both ...