Cross Polarized Light
Cross Polarized Light - Related Videos
01:01
Group Polarization
0 Views •
2020
Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition. The phenomenon of group polarization explains many actions taken by groups that would not...
03:37
Molecular Shape and Polarity
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2020
Dipole Moment of a Molecule Polar covalent bonds connect two atoms with differing electronegativities, leaving one atom with a partial positive charge (δ+) and the other atom with a partial negative charge (δ–), as the electrons are pulled toward the more electronegative atom. This separation of charge gives rise to a bond dipole moment. The magnitude of a bond dipole moment is represented by the Greek letter mu (µ) and is given by the formula shown here, where Q is the magnitude of the...
14:18
Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Cited by 2 •
2016
A protocol to detect and automate mode locking in a pre-adjusted nonlinear polarization rotation fiber laser is presented. The detection of a sudden change in the output polarization state when mode locking occurs is used to command the alignment of an intra-cavity polarization controller in order to find mode-locking conditions.
08:45
Genetic Crosses
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2023
To dissect genetic processes or create organisms with novel suites of traits, scientists can perform genetic crosses, or the purposeful mating of two organisms. The recombination of parental genetic material in the offspring allows researchers to deduce the functions, interactions, and locations of genes. This video will examine how genetic crosses were influential in developing Mendel's three laws of inheritance, which form the basis of our understanding of genetics. One genetic crossing...
08:55
Making a Geologic Cross Section
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2023
Source: Laboratory of Alan Lester - University of Colorado Boulder Geologic maps were first made and utilized in Europe, in the mid-to-late 18th century. Ever since, they have been an important part of geological investigations all around the world that strive to understand rock distributions on the surface of the earth, in the subsurface, and their modification through time. A modern geologic map is a data-rich representation of rocks and rock-structures in a two-dimensional plan view. The...
FAQs
The perpendicular analyzer suppresses light that retains the polarization produced by the first filter, creating a dark reference field. A sample becomes visible only when it changes the light’s polarization before it reaches the analyzer. This arrangement increases contrast between structurally ordered regions and the surrounding background, making polarization changes easier to detect.
Birefringent or anisotropic material interacts with polarized light differently according to its internal organization and direction. That interaction alters the polarization state sufficiently for some light to pass through the analyzer. Regions that produce a stronger change appear brighter, allowing optical contrast to reflect variations in molecular order within fibers, crystals, membranes, or other assemblies.
Brightness indicates that a region has changed the polarization of transmitted light, which is consistent with internal order or directional structure. Comparing bright and dark regions can therefore help identify organized material and characterize structural differences. The image is most useful for assessing organization, rather than treating brightness alone as a complete molecular identification.
A basic examination places the sample between two polarizing filters. The first filter generates linearly polarized light, and the second, the analyzer, is rotated to a perpendicular orientation. The observer then evaluates whether the specimen introduces polarization changes that create brightness against the dark background, using contrast to locate organized regions.
Protein fibers, crystals, membranes, and other organized assemblies are useful specimens because their internal structures can alter the direction or state of polarized light. Examination can help distinguish regions with different degrees of molecular order and support structural characterization. The approach is therefore relevant when biochemical material forms an organized, directionally structured, or crystalline state.
Images collected under crossed polarizers can reveal whether organized regions appear, disappear, or change in contrast as a material changes. Such differences provide evidence of altered molecular organization or phase state. In biochemistry, this supports comparisons among protein fibers, membranes, crystals, and related assemblies during structural analysis and material identification.