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Related Concept Videos

Gradient Fields01:27

Gradient Fields

A gradient field is a vector field derived from a scalar field. A scalar field assigns a single numerical value to every point in space, such as temperature, pressure, or electric potential. The gradient field describes how that value changes from point to point. It gives both the direction of the fastest increase and the rate of change in that direction.For a scalar field f(x, y), the gradient is written as\begin{equation*}\nabla f=\left\langle \jfrac{\partial f}{\partial x},\jfrac{\partial...
Gauss's Law: Cylindrical Symmetry01:20

Gauss's Law: Cylindrical Symmetry

A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...
Gradient Vectors and Their Applications01:19

Gradient Vectors and Their Applications

Every point on a topographical map corresponds to a particular elevation, so the landscape can be modeled as a surface whose height depends on horizontal position. From any given location, a hiker may face infinitely many directions, but only one direction produces the fastest possible increase in elevation. This unique route is called the direction of steepest ascent, and in multivariable calculus, it is represented by the gradient vector of the elevation function.The gradient vector points...
Cylinders in Three-Dimensional Space01:28

Cylinders in Three-Dimensional Space

A cylindrical surface is generated when a two-dimensional profile curve is translated along a straight line in three-dimensional space. The translated copies of the curve form a surface composed of parallel rulings, each oriented in the same fixed direction. This construction allows many three-dimensional forms to be described using relatively simple planar equations.In Cartesian coordinates, a cylindrical surface is often recognized by an equation that omits one of the three variables. For...
Gradient and Del Operator01:14

Gradient and Del Operator

In mathematics and physics, the gradient and del operator are fundamental concepts used to describe the behavior of functions and fields in space. The gradient is a mathematical operator that gives both the magnitude and direction of the maximum spatial rate of change. Consider a person standing on a mountain. The slope of the mountain at any given point is not defined unless it is quantified in a particular direction. For this reason, a "directional derivative" is defined, which is a vector...
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Design Example: Traverse Angle Computations

Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...

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Updated: Jun 16, 2026

Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
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Published on: June 12, 2015

Ray Tracing in Cylindrical Gradient-index Media.

E W Marchand

    Applied Optics
    |February 2, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Two families of gradient-index (GRIN) functions with cylindrical symmetry allow exact ray tracing. One family exhibits focusing properties, suitable for GRIN rods and optical system design.

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    Area of Science:

    • Optics
    • Mathematical Physics

    Background:

    • Gradient-index (GRIN) materials offer unique optical properties by varying refractive index spatially.
    • Exact analytical solutions for ray propagation in GRIN media are rare, limiting design flexibility.

    Purpose of the Study:

    • To identify and analyze families of cylindrical gradient-index functions with exactly solvable ray equations.
    • To explore the potential applications of these functions in optical systems, including GRIN rods.

    Main Methods:

    • Analytical integration of the differential equations governing ray paths within specific GRIN function families.
    • Investigation of the focusing characteristics of the derived ray trajectories.

    Main Results:

    • Two distinct families of cylindrical GRIN functions permit complete, approximation-free integration of ray differential equations.
    • One family demonstrates intrinsic focusing capabilities, making it a candidate for GRIN rod applications.

    Conclusions:

    • The identified GRIN functions provide exact analytical models for ray propagation.
    • These solutions can significantly aid in the design and optimization of optical systems incorporating gradient-index elements, such as GRIN rods.