TW Cronin · 2011 · 147 — We review the current state of knowledge concerning how polarization and polarization patterns are formed in nature, emphasizing linearly polarized light.

Brightfield illumination is one of the most widely used observation modes in optical microscopy. Brightfield illumination is one of the most widely used ...

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It state that the tangent of the polarization angle of incidence of a transparent medium is equal to the refractive index of the medium.

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Organic compounds that exist in both left and right handed forms are called stereoisomers. Those that are perfect mirror images of one another are called enantiomers. They demonstrate equal amounts, but opposite directions of optical rotation. In all other respects, their physical and chemical properties are identical. Their physiological actions may differ, because enzymes and other biological receptors can readily discriminate between many enantiomeric pairs. The other isomers may be indigestible or even toxic. Some are just interesting.

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All sugars produced by living things are right-handed molecules, but they may rotate the polarization of light in either direction. Glucose is the most abundant simple sugar (monosaccharide) and is the primary source of energy for all living things. Its name comes from the Greek word for sweet, γλυκος (glykos). Because it rotates plane polarized light clockwise it is also known as dextrose. Fructose is another simple sugar. Its name comes from the Latin word for fruit, fructus. Because it rotates plane polarized light counterclockwise it is also known as levulose.

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Light is a transverse electromagnetic wave that can be seen by a typical human. Wherever light goes, the electric and magnetic fields are disturbed perpendicular to the direction of propagation. This propagating disturbance is what makes light a wave. The fact that the electric and magnetic fields are disturbed makes light an electromagnetic wave. The fact that it disturbs these fields at right angles to the direction of propagation makes light a transverse wave. In this section we will explore what it means to be transverse.

Imagine a light wave traveling toward you, on its way to entering your eye. In what direction is the electric field vibrating? (Light is both electric and magnetic, but it is usually the electric field that we are interested in.) Up and down? Sure. Left and right? Sure, why not. Both alignments are perpendicular to the propagation of the wave.

LED ring lights are easy to set up and use, creating professional-quality lighting right out of the box. Circular in shape, ring lights ensure the subject is lit evenly with soft, direct light that minimizes shadows. Older fluorescent circle lights produced a bright white light that would often wash the subject out, but modern LED ring lights produce a softer effect for beautiful photos and videos. Most ring lights are dimmable, allowing greater versatility and control over color temperature.

No. Not all LED ring lights come with a color-changing function. Some circle lights only have a single, fixed color temperature, while others have the ability to change the color temperature or even offer multiple color options. Be sure to check the product specifications of the ring light to determine its color capabilities.

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Carvone is a member of a family of chemicals called terpenoids. Carvone has two enantiomers: a right-handed form which is found in the seed oils of caraway, dill, and anise; and a left-handed form which is found in spearmint oil. The difference in the two flavors is evidence that odor receptors have activation sites that are chiral. Your nose can smell the handedness of some molecules.

Most LED ring lights are dimmable, allowing the user to adjust the intensity of the light output. Some provide complete dimming customization with stepless adjustment, while others give you levels of brightness to select. As always, be sure to check the dimming specifications on the ring light you are considering.

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Most light sources are unpolarized. The electric field is vibrating in many directions; all perpendicular to the direction of propagation. Polarized light is unique in that it vibrates mostly in one direction. Any direction is possible as long as it's perpendicular to the propagation, be it…

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Polarized light carries information. Magnetic fields, chemical interactions, crystal structures, quality variations, and mechanical stresses can all affect the polarization of a beam of light.

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Chirality is the property of some objects that makes them distinguishable from their mirror images. Objects that exhibit chirality are said to be chiral. Human hands are the most easily accessible examples of chiral objects, which is why chirality is also often described as handedness. Chirality is just a painfully clever scientific word derived from the Greek word for hand — χερι (kheri).

Chemically bonding glucose and fructose produces sucrose — the stuff that most people today would call sugar (or maybe table sugar). Its name comes from the French word for sugar, sucre. The disaccharide sucrose is dextrorotatory but a mixture of the monosaccharides glucose and fructose is levorotatory. "Invert sugar" is made by heating a solution of sucrose and water. The two halves of the disaccharide separate (hydrolyze) and the rotation caused by the fructose dominates. The polarization of the solution has been "inverted" but the sugars themselves have not had their chirality inverted. Doing this would require the inversion of the molecule in three separate places, which is an extremely tricky thing to do.

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It should come as no surprise as to why ring lights are so popular among photographers and vloggers. Photographers often use these circle lights for macro photography and portraits as they are a relatively inexpensive way to achieve professional-quality lighting effects. Shooting small objects and close-ups require evenly balanced lighting to emphasize details. This is especially important for product photography. Ring lights are also a favorite among vloggers and how-to content creators because they can simply set up their phone ring light and begin capturing all of the techniques and fine details for enhanced visibility.

Determining whether a particular compound is right- or left-handed is determined by a particularly complicated set of rules that I don't understand (and don't care to understand at this moment), but being able to do so is especially important in organic chemistry. Something possibly useful to know for physics students is that all naturally occurring sugars are right-handed and all naturally occurring amino acids are left-handed (except glycine, which is not chiral).

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A typical hand consists of four fingers, a thumb, and a palm. (In this context, a thumb is not considered a finger.) Using the two hands of one person, it is only ever possible to get two of these parts to point in the same direction at the same time.

spectroscopy, polarimetry, defectoscopy, astronomy, platography, material research, laser applications, light modulation, agricultural production, electric power generation, environmental control devices, molecular biology, biotechnology

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Optical rotation is the ability that all chiral molecules have to rotate plane polarized light. Think of a polarized light wave as a hand on an analog clock pointing to the 12. Shifting that hand a bit to the right rotates it clockwise, shifting it to the left rotates it counterclockwise. The Latin words for right and left are dexter and laevus, respectively. Chiral molecules that rotate the polarization clockwise are said to be dextrorotatory, while those that rotate it counterclockwise are said to be levorotatory.

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