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  2. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    Examples include ⁠ 1 / 2 ⁠, − ⁠ 8 / 5 ⁠, ⁠ −8 / 5 ⁠, and ⁠ 8 / −5 ⁠. The term was originally used to distinguish this type of fraction from the sexagesimal fraction used in astronomy. [10] Common fractions can be positive or negative, and they can be proper or improper (see below).

  3. Fraunhofer diffraction equation - Wikipedia

    en.wikipedia.org/wiki/Fraunhofer_diffraction...

    Diffraction geometry, showing aperture (or diffracting object) plane and image plane, with coordinate system. If the aperture is in x ′ y ′ plane, with the origin in the aperture and is illuminated by a monochromatic wave, of wavelength λ, wavenumber k with complex amplitude A(x ′,y ′), and the diffracted wave is observed in the unprimed x,y-plane along the positive -axis, where l,m ...

  4. Diffraction - Wikipedia

    en.wikipedia.org/wiki/Diffraction

    A diffraction pattern of a red laser beam projected onto a plate after passing through a small circular aperture in another plate. Diffraction is the deviation of waves from straight-line propagation due to an obstacle or through an aperture. The diffracting object or aperture effectively becomes a secondary source of the propagating wave.

  5. “What’s The Most Frugal Thing You Do?” (50 Answers) - AOL

    www.aol.com/people-shared-66-most-frugal...

    I’m an avid reader, I use the public library not only for books, but online classes, learn a new language, Libby, check out tools, & fun activities for the grandkids. Image credits: Genie_noteC #5

  6. Kirchhoff's diffraction formula - Wikipedia

    en.wikipedia.org/wiki/Kirchhoff's_diffraction...

    A geometrical arrangement used in deriving the Kirchhoff's diffraction formula. The area designated by A 1 is the aperture (opening), the areas marked by A 2 are opaque areas, and A 3 is the hemisphere as a part of the closed integral surface (consisted of the areas A 1, A 2, and A 3) for the Kirchhoff's integral theorem.

  7. Teenage girl's motive in Wisconsin school shooting still ...

    www.aol.com/news/teenage-girls-motive-wisconsin...

    The shooter, Natalie Rupnow, 15, was found dead by responding officers at Abundant Life Christian School around 11 a.m. on Monday, according to police. "Identifying a motive is our top priority ...