Elementary geometry

Confocal

In geometry, confocal means having the same foci: confocal conic sections. * For an optical cavity consisting of two mirrors, confocal means that they share their foci. If they are identical mirrors, their radius of curvature, Rmirror, equals L, where L is the distance between the mirrors. * In conic sections, it is said of two ellipses, two hyperbolas, or an ellipse and a hyperbola which share both foci with each other. If an ellipse and a hyperbola are confocal, they are perpendicular to each other. * In optics, it means that one focus or image point of one lens is the same as one focus of the next lens. (Wikipedia).

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From playlist Advanced Calculus / Multivariable Calculus

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From playlist Real Analysis

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From playlist Is the Functions Continuous or Not?

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From playlist Programming

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From playlist Calculus

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From playlist Differential Equations

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From playlist Integrable Systems 9th Workshop

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From playlist The Limit

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From playlist IIT Delhi: Nano structured materials-synthesis, properties, self assembly and applications | CosmoLearning.org Materials Science

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From playlist Science & Engineering Visualization Challenge 2012

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From playlist Concavity and Inflection Points

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From playlist Microbiology/Infectious Diseases

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From playlist MIT RES.6-006 Video Demonstrations in Lasers and Optics

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From playlist MIT RES.6-006 Video Demonstrations in Lasers and Optics

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From playlist MATRIX-SMRI Symposium: Nijenhuis Geometry and integrable systems

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From playlist Learn all about Parabolas #Conics

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From playlist Elements | Seeker

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From playlist SciCafe

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From playlist Fluctuations in Nonequilibrium Systems: Theory and Applications

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From playlist Functions

Related pages

Focus (geometry) | Confocal conic sections | Hyperbola | Perpendicular | Ellipse | Conic section | Geometry