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in optics a vector diagram representing the dependence on direction of the characteristics of a light field (light intensity and polarization) or of the optical characteristics of the medium (indexes of refraction; reflectivity).

A particular case of the indicatrix is the scattering indicatrix, which represents the dependence of the intensity of the scattered light on the angle of scattering under the condition that the incident light is not polarized, and the optical indicatrix (in crystal optics). The optical indicatrix of an optically isotropic medium is a sphere. The indicatrix for crystals with trigonal, hexagonal, and tetragonal systems is an ellipsoid of revolution. The indicatrix for crystals with rhombic, monoclinic, and tri-clinic systems is a general ellipsoid.

The indicatrix is used when the analytical equations for the corresponding angular dependences are complex or unknown, and also for the systematization of experimental data.

References in periodicals archive ?
The recorded species of Foraminifera are as follows: Alveolina indicatrix HOTTINGER, 1960.
Alveolina indicatrix HOTTINGER,1960 is recorded from lower and middle part of Chorgali Formation, from Jhalar station section.
Tissot's indicatrix is based on a set of equally sized circles on curved surface of the globe.
The example of plane map of the world in an equirectangular projection with Tissot's indicatrix of distortion of radius of 500 km is presented in Figure 12.
Let the spherical indicatrix of the principal normal vector of the curve C be denoted by [C.
2] be the tangent vector of the spherical indicatrix of the principal normal vector of the curve C and let [[bar.
The indicatrix for an isometric crystal is a sphere (see Fig.
We observe that the mentioned indicatrix can be a helix, so, one can ask whether this tangent spherical image is a general helix or not.
This curve is called the trinormal spherical image or trinormal indicatrix of the curve [beta] in [E.
2) The following statement about dispersion is given: "Dispersion follows in the format r [greater than] v or r [less than] v in accordance with whether the indices are greater for red or violet light, but the notation may also refer to dispersion of the optic axis or orientation of the indicatrix.
This enables one to explain that the nonlinear effects in the polarizability are linked with a "nonspherical optical indicatrix surface on microstructures distribution of the crystalline phase" [3].
A generalization of the Clausius-Mosotti [1] expression for dense polymeric media, taken as similar to high density solution with nonspherical optical indicatrix representation [3] due to the effect of its environment polarization, is given by

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