Polarized and unpolarizedlight

Secondly, how can the orientation of [polarised] electric vectors come to lay perpendicular to the plane of incidence and parallel to the reflecting surface? If electric fields oscillate perpendicular to the direction of propagation, how can they be parallel to the reflecting surface after their reflection?

Plane polarizedlight

What does this all mean for brightness? When driving down the highway, why is the polarised light perceived so brightly? Wouldn't unpolarised reflected light have the same or more energy/intensity?

Polarization by reflection

The Brewster's angle boils down to the angle at which all light from the (polarized) incident ray is refracted, and none is reflected. So, to your first point, no, the refracted ray doe not gain energy as it gets refracted.

Firstly, does this mean that the energy of the electric fields (which were previously in different planes) culminate into the single plane, and thus that plane now possesses much more energy?

What ispolarization

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Polarization oflightnotes PDF

Firstly, does this mean that the energy of the electric fields (which were previously in different planes) culminate into the single plane, and thus that plane now possesses much more energy?

"The principle behind Brewster's angle is illustrated Figure 3 for a single ray of light reflecting from the flat surface of a transparent medium having a higher refractive index than air. The incident ray is drawn with only two electric vector vibration planes, but is intended to represent light having vibrations in all planes perpendicular to the direction of propagation. When the beam arrives on the surface at a critical angle (Brewster's angle; represented by the variable θ in Figure 3), the polarization degree of the reflected beam is 100 percent, with the orientation of the electric vectors lying perpendicular to the plane of incidence and parallel to the reflecting surface. The incidence plane is defined by the incident, refracted, and reflected waves. The refracted ray is oriented at a 90-degree angle from the reflected ray and is only partially polarized."

The polarized light you see in puddles of water or mirage, when driving on the highway, is a reflection from the sun which is why it's so bright. It's brighter than the rest of the light because it gets reflected off more reflective surfaces (puddles of water vs asphalt). The fact that it's polarized is merely a coincidence. Many displays (like the ones on LCD clock, for example) project polarized light which is much dimmer than the sun's reflection. It's the source of the light that makes the it bright, not the nature of the polarization.

Polarization examples

Blue light, which is a high-energy visible (HEV) light with wavelengths between 380 and 500 nanometers, is emitted by various sources, including digital screens, LED lights, and the sun. While blue light is essential for regulating our circadian rhythm and boosting alertness during the day, excessive exposure, especially in the evening, can have several harmful effects on our health.

Circularly polarizedlight

Blue light, or HEV light, is a color in the visible light spectrum that the human eye can see. As a short wavelength, it produces higher amounts of energy. The eyes cannot effectively filter blue light as opposed to other types of light, so it may pass through the eye to the retina.

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I'm trying to learn about the physics of polarisation, which feels like an uphill battle. I've just read the notes from this page:

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The other questions are quit unclear. The electric field component is always directed perpendicular to the direction of propagation - in vacuum. The surface of some media - as well as the above described polarizers - turn the equally distributed electric field component into specific directions. That is why we observe it. We are using a natural phenomena.

To your second point on orientation of the electric vectors, this illustration should help (a picture is worth 1000 words):

It is easy to prove this statement. Take two polarizer under 90° to each over and no light is going through. The polarized light behind the first polarizer can’t go through the second polarizer. Now place a third polarizer between the others under 45°. You will see (polarized) light behind this setup. To realize what happens, try to find another explanation for how polarized light goes through the setup of these three polarizers.

What is polarizing lightin physics

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For polarized light the electric field component is aligned in on plain now. But this is not relevant for our seeing. Since we haven’t polarizers in our eyes, we don’t see any differences in polarized and unpolarized light. But the intensity of the light has approx. half the value of the unpolarized light. Since our eyes adopt themselves to different brightnesses, you has to use a photodiode or better a camera to measure the different brightnesses.