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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 ]
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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?

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

NPR likewise:

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

And then there’s this:

Sebastian Gorka told MSNBC

Gorka in full:

Sometimes an attack is unequivocally clear for what it is. When somebody shouts ALlahu Akbar as they’re stabbing a police officer, it’s pretty clear it’s not a case of the mafia robbing a bank, wouldn’t you say so?

Eh?

Vox is oppositely polarized to Gorka et alii:

As, indeed, am I.

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Incientally, all you special ops types with cool shades:

For lightweight, functional shades that protect your eyes in any lighting situation, Oakley has designed the SI Flak Jacket. Featuring an innovative 8.75 base lens curvature for optimal peripheral vision, these sunglasses provide side eye protection as well as a maximal field of view. The stress-resistant O-Matter frame found in many Oakley tactical models is lightweight, ergonomic and will not succumb to the pressures of constant wear and travel. The Plutonite polycarbonate lenses fully filter out harmful UVA, UVB, UVC and blue light up to 400 nm for maximum sun protection. Oakley also has included an Iridium coating on the lenses which reduces glare in extremely bright light. For adaptability in any environment, the lenses are easily interchangeable. « less

Take heed:

Polarization has a wealth of other applications besides their use in glare-reducing sunglasses.

Like — in USian politics?

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Okay, time for the test. Sample question:

Answer:

A. Referring to the above question, the glare is the result of a large concentration of light aligned parallel to the water surface. To block such plane-polarized light, a filter with a vertically aligned polarization axis must be used.

7 Responses to “Polarized light — pls review before final exam, Thurs”

  1. Scott Says:

    Has it been conclusively proven that it was an attack? So far, I’ve heard:
    1.) Terror attack.
    2.) Alt-right driver panicked and accelerated by accident
    3.) Antifa driver

    Which is the truth?

  2. Charles Cameron Says:

    Here’s what I’ve gathered:
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  3. Charles Cameron Says:

    Via Clint Watts:
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    Via JJ MacNab:
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  4. Grurray Says:

    Gorka might be referring to the phone threats to synagogues earlier this year. The press condemned Trump for not denouncing them, but the reason he didn’t was because the FBI was about to arrest the real perpretator, an Israeli teenaged hacker.
    .
    That data in the Newsweek link has some categorization errors. Racists committing crimes with premeditation is considered terror. Honor killings by Muslims, of which there are an estimated 20 – 30 per year, aren’t counted. Also, I noticed the 2014 Las Vegas spree killings on the ADL list, but they could be considered Leftists not Right Wing. That brings up the issue of what Left or Right really means in the first place. Is it a spectrum, a horse shoe, a circle?
    Are there then Left and Right Islamists? At least by how they’re defined by who they oppose, which seems to be what these lists are doing.

  5. Charles Cameron Says:

    HI Grurray:

    Honor killings by Muslims, of which there are an estimated 20 – 30 per year, aren’t counted.

    Are there any Hindu, Christian or SIkh honor killings in the US? I know in the UK there are, according to police reports, and vast swathes of the Muslim world from which these never arise..
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    Without getting into moral relativism, there are topics upon topics where almost any generalization is liable to run into exceptions — as Hopkins said, the world is dappled..

  6. Charles Cameron Says:

    Sorry, when I first typed the above comment, my “memory” dropped an earlier an totally unrelated quote into the italicised space than I’d intended — I’ve corrected it now.
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    Cld you explain abt Gorka and Synagogues? SG follows me on Twitter, sort of an odd honor..

  7. Grurray Says:

    Charles, it was Jewish community centers
    https://en.wikipedia.org/wiki/2017_Jewish_Community_Center_bomb_threats
    I’m not aware of honor killings by other ethnic groups in America. It does seem like feminist rights and women safety issues are focused on white Christians. Is that because that group is more likely to have those problems or just that it’s easier to target that group?
    .
    This is an important issue, and we definitely need to recognize and interdict threats to innocent and vulnerable citizens as well as to government institutions. Maybe for anti-terrorism we need a better understanding of what may be systemic threats, therefore potentially conflagratory, and those that are less likely to spread through a critical threshold. I understand the concerns reflected in the ADL Right Wing list, but the FBI most wanted terrorist list shows other concerns that back up Trump and Gorka.
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    I don’t have much experience with White Supremacists, so I would presume we should err on the side of caution. I have met some anti-government/militia types and would tend to think they aren’t at the same risk level. If we were getting into moral relativism the analogy might be between the Black Panthers and Rev Wright’s church. Or possibly between al Qaeda and the Muslim Botherhood.

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