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  2. Reflector sight - Wikipedia

    en.wikipedia.org/wiki/Reflector_sight

    The dot remains on the target even though the viewer's head is moved side to side. A reflector sight or reflex sight is an optical sight that allows the user to look through a partially reflecting glass element and see an illuminated projection of an aiming point or some other image superimposed on the field of view.

  3. Exercises for Your Eyes - WebMD

    www.webmd.com/eye-health/eye-exercises

    Gently cup your palms over your closed eyes until all the afterimages fade to black, about 30 seconds. Make sure not to put any pressure on your eyes. Figure eight. Imagine a big number 8 turned ...

  4. Finderscope - Wikipedia

    en.wikipedia.org/wiki/Finderscope

    A finderscope is an accessory sighting device used in astronomy and stargazing, typically a small auxiliary refracting telescope / monocular mounted parallelly on a larger astronomical telescope along the same line of sight. The finderscope usually has a much smaller magnification than the main telescope, thus providing a larger field of view ...

  5. LogMAR chart - Wikipedia

    en.wikipedia.org/wiki/LogMAR_chart

    History. The chart was designed by Ian Bailey and Jan E. Lovie-Kitchin at the National Vision Research Institute of Australia. They described their motivation for designing the LogMAR chart as follows: "We have designed a series of near vision charts in which the typeface, size progression, size range, number of words per row and spacings were chosen in an endeavour to achieve a ...

  6. Math Anxiety: How to Spot It and How to Cope - Healthline

    www.healthline.com/health/anxiety/math-anxiety

    According to the American Psychological Association (APA), math anxiety is a type of anxiety that happens in response to math or math-related situations. Math anxiety can cause a wide range of ...

  7. Logarithm - Wikipedia

    en.wikipedia.org/wiki/Logarithm

    In mathematics, the logarithm is the inverse function to exponentiation. That means that the logarithm of a number x to the base b is the exponent to which b must be raised to produce x. For example, since 1000 = 103, the logarithm base of 1000 is 3, or log10 (1000) = 3.

  8. Logarithmic scale - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_scale

    A logarithmic scale (or log scale) is a method used to display numerical data that spans a broad range of values, especially when there are significant differences between the magnitudes of the numbers involved. Unlike a linear scale where each unit of distance corresponds to the same increment, on a logarithmic scale each unit of length is a ...

  9. Log–log plot - Wikipedia

    en.wikipedia.org/wiki/Loglog_plot

    In science and engineering, a loglog graph or loglog plot is a two-dimensional graph of numerical data that uses logarithmic scales on both the horizontal and vertical axes. Power functions – relationships of the form – appear as straight lines in a loglog graph, with the exponent corresponding to the slope, and the coefficient ...

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