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  2. Prism correction - Wikipedia

    en.wikipedia.org/wiki/Prism_correction

    Prism correction is measured in prism dioptres. A prescription that specifies prism correction will also specify the "base". The base is the thickest part of the lens and is opposite from the apex. Light will be bent towards the base and the image will be shifted towards the apex.

  3. One-loop Feynman diagram - Wikipedia

    en.wikipedia.org/wiki/One-loop_Feynman_diagram

    In physics, a one-loop Feynman diagram is a connected Feynman diagram with only one cycle ( unicyclic ). Such a diagram can be obtained from a connected tree diagram by taking two external lines of the same type and joining them together into an edge.

  4. Minimum deviation - Wikipedia

    en.wikipedia.org/wiki/Minimum_deviation

    This angle of incidence where the angle of deviation in a prism is minimum is called the minimum deviation position of the prism and that very deviation angle is known as the minimum angle of deviation (denoted by δ min, D λ, or D m).

  5. Perturbation theory - Wikipedia

    en.wikipedia.org/wiki/Perturbation_theory

    Examples of the kinds of solutions that are found perturbatively include the solution of the equation of motion ( e.g., the trajectory of a particle), the statistical average of some physical quantity ( e.g., average magnetization), and the ground state energy of a quantum mechanical problem.

  6. Dispersion relation - Wikipedia

    en.wikipedia.org/wiki/Dispersion_relation

    In a prism, dispersion causes different colors to refract at different angles, splitting white light into a rainbow of colors. In the physical sciences and electrical engineering, dispersion relations describe the effect of dispersion on the properties of waves in a medium.

  7. Quantum electrodynamics - Wikipedia

    en.wikipedia.org/wiki/Quantum_electrodynamics

    In particle physics, quantum electrodynamics (QED) is the relativistic quantum field theory of electrodynamics. In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved.

  8. Esophoria - Wikipedia

    en.wikipedia.org/wiki/Esophoria

    Esophoria is an eye condition involving inward deviation of the eye, usually due to extra-ocular muscle imbalance. It is a type of heterophoria. Cause. Causes include: Refractive errors; Divergence insufficiency; Convergence excess; this can be due to nerve, muscle, congenital or mechanical anomalies.

  9. Effective mass (spring–mass system) - Wikipedia

    en.wikipedia.org/wiki/Effective_mass_(spring...

    The effective mass of the spring in a spring-mass system when using a heavy spring (non-ideal) of uniform linear density is of the mass of the spring and is independent of the direction of the spring-mass system (i.e., horizontal, vertical, and oblique systems all have the same effective mass). This is because external acceleration does not ...

  10. Chaos theory - Wikipedia

    en.wikipedia.org/wiki/Chaos_theory

    Chaos theory. A plot of the Lorenz attractor for values r = 28, σ = 10, b = 8 3. An animation of a double-rod pendulum at an intermediate energy showing chaotic behavior. Starting the pendulum from a slightly different initial condition would result in a vastly different trajectory.

  11. Effective medium approximations - Wikipedia

    en.wikipedia.org/wiki/Effective_medium...

    In materials science, effective medium approximations ( EMA) or effective medium theory ( EMT) pertain to analytical or theoretical modeling that describes the macroscopic properties of composite materials. EMAs or EMTs are developed from averaging the multiple values of the constituents that directly make up the composite material.