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Purkinje images are reflections of objects from the structure of the eye. They are also known as Purkinje reflexes and as Purkinje–Sanson images. At least four Purkinje images are usually visible in the normal eye. The first Purkinje image (P1) is the reflection from the outer surface of the cornea. The second Purkinje image (P2) is the ...
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In 1923 Italian physicist Vasco Ronchi published a description of the eponymous Ronchi test, [1] [2] which is a variation of the Foucault knife-edge test [3] [4] and which uses simple equipment to test the quality of optics, especially concave mirrors. [5] [6]. A "Ronchi tester" consists of: A light source; A diffuser; A Ronchi grating
The European Union reached a blockbuster free trade agreement Friday with Brazil, Argentina and the three other South American nations in the Mercosur trade alliance, capping a quarter-century of ...
For many older adults, Social Security makes the difference between enjoying a comfortable retirement and struggling to make ends meet. Working in retirement can be a smart way to create financial ...
A free body diagram is not a scaled drawing, it is a diagram. The symbols used in a free body diagram depends upon how a body is modeled. [6] Free body diagrams consist of: A simplified version of the body (often a dot or a box) Forces shown as straight arrows pointing in the direction they act on the body
Enjoy a classic game of Hearts and watch out for the Queen of Spades!
Penguin diagram: a quark changes flavor via a W or Z loop Tadpole diagram: One loop diagram with one external leg Self-interaction or oyster diagram An electron emits and reabsorbs a photon Box diagram The box diagram for kaon oscillations: Photon-photon scattering: Higgs boson production: Via gluons and top quarks: Via quarks and W or Z bosons ...