Polarized light — pls review before final exam, Thurs

[ by Charles Cameron — actually the exam is daily, ongoing — and we’re not scoring very high marks ]


Unpolarized light vibrates in any planes:

A light wave that is vibrating in more than one plane is referred to as unpolarized light. Light emitted by the sun, by a lamp in the classroom, or by a candle flame is unpolarized light. Such light waves are created by electric charges that vibrate in a variety of directions, thus creating an electromagnetic wave that vibrates in a variety of directions. This concept of unpolarized light is rather difficult to visualize. In general, it is helpful to picture unpolarized light as a wave that has an average of half its vibrations in a horizontal plane and half of its vibrations in a vertical plane.

Polarized light vibrates in only one plane:

It is possible to transform unpolarized light into polarized light. Polarized light waves are light waves in which the vibrations occur in a single plane. The process of transforming unpolarized light into polarized light is known as polarization.

The most common method of polarization involves the use of a Polaroid filter. Polaroid filters are made of a special material that is capable of blocking one of the two planes of vibration of an electromagnetic wave. .. In this sense, a Polaroid serves as a device that filters out one-half of the vibrations upon transmission of the light through the filter. When unpolarized light is transmitted through a Polaroid filter, it emerges with one-half the intensity and with vibrations in a single plane; it emerges as polarized light.

This works either way — so to speak, either vertically, or horizontally — though not, by definition, both at once. Ohh, and there’s paradox involved:

Read the whole lesson at The Physics Classroom: Polarization — and memorize, remember?


Ali Soufan notices polarization in our political sphere wrt events we label or do not label terrorist:

Big difference in how President Trump reacted to the London Bridge and #Charlottesville car attacks.

— Ali H. Soufan (@Ali_H_Soufan) August 12, 2017

NPR likewise:

When Is It "Terrorism"? How The Media Covers Attacks By Muslim Perpetrators https://t.co/KSI9oLlUi0

— NPR Politics (@nprpolitics) June 20, 2017

Tim Furnish sees this polarization as avoiding mention of Islamic influence when it is clearly present:

#Charlottesville driver's car was still accelerating when "terrorism" alleged. But shouting "Allahu Akbar" & killing folks never called that

— Dr. Timothy Furnish (@Occidentaljihad) August 12, 2017

And then there’s this:

Uproar over #CharlottesvilleKKK & Jew-hate, but you all yawned last week when it was Muslim imams calling for Armageddon against Jews https://t.co/dYDUCRNyYy

— SHIREEN QUDOSI (@ShireenQudosi) August 12, 2017

Sebastian Gorka told MSNBC

https://t.co/HIMMGEOxOP"..shouts Allahu Akbar as they're..stabbing a police officer, it’s..clear it’s not..case..the mafia robbing a bank..”

— I. Ryan (@EttasPlace) August 9, 2017

Gorka in full:

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