please answer fast exam near
Asked by SSHHII | 16th Jan, 2010, 10:14: PM
Refer to the following excerpt from Wikipedia.
Double refraction, is the decomposition of a ray of light into two rays (the ordinary ray and the extraordinary ray) when it passes through certain types of material, such as calcite crystals or boron nitride, depending on the polarization of the light. This effect can occur only if the structure of the material is anisotropic (directionally dependent). If the material has a single axis of anisotropy or optical axis, (i.e. it is uniaxial) birefringence can be formalized by assigning two different refractive indices to the material for different polarizations. The birefringence or double refraction magnitude is then defined by
where no and ne are the refractive indices for polarizations perpendicular (ordinary) and parallel (extraordinary) to the axis of anisotropy respectively.
Answered by | 17th Jan, 2010, 11:23: AM
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