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2. Focal length - Wikipedia

   en.wikipedia.org/wiki/Focal_length

   Focal length. The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a ...

3. List of knowledge deities - Wikipedia

   en.wikipedia.org/wiki/List_of_knowledge_deities

   Gamayun - symbol of knowledge and wisdom [citation needed] Veles - Veles has been the most revered god in the Vedic pantheon of Slavic culture since ancient times. He is the patron saint of the interworld — both Light and Darkness are subject to him, he is also called Prophetic, Wise, because in the three worlds he manifests his power, he is ...

4. Focus (optics) - Wikipedia

   en.wikipedia.org/wiki/Focus_(optics)

   In geometrical optics, a focus, also called an image point, is a point where light rays originating from a point on the object converge. [1] Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle. This non-ideal focusing may be caused by aberrations of the imaging optics.

5. f-number - Wikipedia

   en.wikipedia.org/wiki/F-number

   f-number. Diagram of decreasing apertures, that is, increasing f-numbers, in one-stop increments; each aperture has half the light-gathering area of the previous one. An f-number is a measure of the light-gathering ability of an optical system such as a camera lens. It is calculated by dividing the system's focal length by the diameter of the ...

6. Dioptre - Wikipedia

   en.wikipedia.org/wiki/Dioptre

   A dioptre ( British spelling) or diopter ( American spelling ), symbol dpt, is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dpt = 1 m−1. It is normally used to express the optical power of a lens or curved mirror, which is a physical quantity equal to the reciprocal of the focal length ...

7. Chakras: A Beginner’s Guide to the 7 Chakras - Healthline

   www.healthline.com/health/fitness-exercise/7-chakras

   It’s the middle of the seven chakras, so it bridges the gap between our upper and lower chakras, and it also represents our ability to love and connect to others. When out of alignment, it can ...

8. How to Stay Focused: 10 Tips to Improve Your Focus and ...

   www.healthline.com/health/mental-health/how-to...

   declutter the space where you will be working. 2. Coffee in small doses. Drinking coffee, or other caffeinated beverages, in small doses may positively impact your ability to focus. A 2021 study ...

9. Focus (geometry) - Wikipedia

   en.wikipedia.org/wiki/Focus_(geometry)

   Focus (geometry) Point F is a focus point for the red ellipse, green parabola and blue hyperbola. In geometry, focuses or foci ( / ˈfoʊkaɪ /; sg.: focus) are special points with reference to which any of a variety of curves is constructed. For example, one or two foci can be used in defining conic sections, the four types of which are the ...