Test 8 - Polarization microscopy

For observation of a conoscopic pattern mainly used ....

• objectives with small aperture

• objectives with large aperture

• objectives with correction ring

• objectives with short working distance

What is birefringence?

• The effect of splitting a light beam in an anisotropic medium into two mutually orthogonal components propagating within the medium at different speeds

• Different absorption of light of right and left circular polarizations

• The ability to rotate the plane of polarization of light passing through an object

• Same as dichroism

Select the correct statements about dichroism

• Occurs in uniaxial minerals

• Occurs in biaxial minerals

• The mineral will have two primary colors

• A ray of light passing through such a mineral will be divided into ordinary and extraordinary rays

Select the images related to the biaxial crystal

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What do conoscopic pattern allow you to determine?

• Number of object axes

• Optical sign of crystal

• Morphology of the object

• Crystal structure

• Chemical composition

What are the basic requirements for glass optics in polarization microscopy?

• No deformations

• There are no special requirements other than cleanliness

• No internal stresses

• Small thicknesses

Select the correct statements

• Both orthoscopy and conoscopy require the use of a monochromatic light source.

• Polarization microscopy objects are examined in both transmitted and reflected light

• With the orthoscopic method of examination, the illumination of the object should be as close as possible to the parallel path of the rays

• The conoscopic method requires the use of a Bertrand lens or an additional microscope

• Both conoscopic and orthoscopic modes use an extended light source

Select a microscope scheme that operates in orthoscopic mode

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In the conoscopic mode, the black stripes corresponding to those directions for which the beam oscillations are parallel to the plane of polarization of the polarizer are called ....

• Isogyres

• Isochromes

• Isobars

• Lines of equal amplitude

Polarization microscopy is needed to study....

• anisotropic objects in polarized light

• isotropic objects in polarized light

• phase objects in polarized light

• electrically polarized objects (for example, dielectrics polarized by an electric field)