In the diagram below, the first polaroid filter has a vertical transmission axis which only permits light with a polarisation axis of the same orientation to pass through.

I've got an led light and magnifying glasses on a headband, they work really well but the nose thing hurts. I'm going to Harbor Freight tomorrow and pick up their lamp/magnifier.

Where `I_0` and `I` are the intensity of light before and after passing through a polariser respectively. θ is the angle between the transmission axis of the polariser and the light’s polarisation axis before passing through the polariser.

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This effect is easily explained with the electromagnetic wave theory, but no manipulation of the particle theory can explain how light is blocked by the second polariser. Thus, Newton's corpuscular model of light is not adequate in explaining polarisation.

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You might want to attach it to something other than what you have your saw mounted on. The vibration will drive you nuts. Make a wall mount or attach it to your work bench. Just not the saw mount.

When I bought the saw I got him a 3" compact cut off tool. When I bought the sanders he said, oh, it's good to have all these tools. lol

My Ottlite came with a 3x and 5x lens.  I use the 3x most of the time as the 5x is too much.  However, I have used it for some special things especially non scrolling.

Many claim the Harbor Freight one is a decent one... I bought all mine from Menards.. which is the same price unless you get a 20 - 25% coupon for Harbor Freight.. Harbor Freight ones have a lens cover lid so it might be safer to have in a shop if you're near a window.. I've heard of people almost starting fires, melting their saw with their magnifier lights.. I kinda like the lid idea... but the way it lifts up I feel like it'd be in the way..

The effects observed with polarised light were critical to the development of the concept that light consists of transverse waves having components that are perpendicular to the direction of propagation. Each of the transverse components must have a specific orientation direction that enables it to either pass through or to be blocked by a polariser. Only those waves with a transverse component parallel to the polarising filter will pass through, and all others will be blocked.

Howdy! I am looking for one of those lights with the magnifying glass with an arm on it, but I don't know where to get a good one. I've read reviews on some of them on Amazon and they're mixed.

Love the LED light with it's "bright, brighter" feature.  That being said, 100% of the time it is on the brightest level.  I can't say that there is any shadows to deal with.  I've also covered the on/off switch with tape to keep dust from getting in there.

conduct investigations quantitatively using the relationship of Malus’ Law `I=I_(max) cos^2 θ` for plane polarisation of light, to evaluate the significance of polarisation in developing a model for light (ACSPH050, ACSPH076, ACSPH120)

A polarising filter absorbs the component of the electric field of the electromagnetic wave that are not parallel to the polarisation direction of the filter.

I bought mind from manards @ the same price as HF and menards is a lot closer fodr me. I have had it ever since they opened up and replacd the bulb once. i am weell satisfied with it,

If a beam of light is allowed to impact a polariser, only light rays oriented parallel to the polarising direction are able to pass through the polariser. If a second polariser is positioned behind the first and oriented in the same direction, then light passing through the first polariser will also pass through the second.

The chemical composition of polaroid filters produces a specific transmission axis for light waves. The intensity of light that is allowed to pass through the filter depends on the angle between the filter and wave’s polarisation axis.

I just got back from Harbor Fr. with the mag/light. I put it on the table and I really like it. The cap is working ok on it, I'll leave it on for now. Thanks for all the help, everyone!

However, the electric fields do not need to be perfectly parallel to pass through, as any component of the electric field that is parallel to the transmission axis will pass. The components that are not parallel to the filter are absorbed. Consequently, the intensity of an electromagnetic wave passing through a polariser is reduced.

Suppose we have a second piece of polaroid whose transmission axis makes an angle θ with that of the first one. The E vector of the light between the polaroids can be resolved into two components, one parallel and one perpendicular to the transmission axis of the second Polaroid (see Figure 1). If we call the direction of transmission of the second polaroid y’,

Polarising filters have a unique molecular structure that allows only light having a single orientation to pass through.

However, if the second polariser is rotated at a small angle, the amount of light passing through will be decreased. When the second polariser is rotated so the orientation is perpendicular to that of the first polariser, then none of the light passing through the first polariser will pass through the second.

The glass lens are very good quality with little distortion.  They are a bit more expensive but worth it for me.  Mine came with two lens.

It has a 5x magnifier with a cover and is probably overkill.  But the closer I put it to the work the easier it is on the eyes.  I don't use the magnifier very often but it is there when I need it.

I just got back from Harbor Fr. with the mag/light. I put it on the table and I really like it. The cap is working ok on it, I'll leave it on for now. Thanks for all the help, everyone!

a good one for the  price. I also have a much more expensive one and it has a few +'s but not enough to justify the extra expense....

Huygens' wave model of light is unable to explain polarisation as this model describes light as longitudinal waves. Longitudinal waves cannot be polarised.

I bought mine when I bought my EX16 at Woodcraft. It looks like they have discontinued it at the store and can't find the name anymore. It works well but since the lights are on the sides, I do get some shadow some times. Did not used the mounting clamp (bench too thick) Drilled matching hole and mounted to bench.

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This can be better understood using the Picket Fence analogy. Light as an electromagnetic wave has oscillating electric and magnetic fields. Polaroid filters exploit the plane of these oscillation by only letting waves whose electric fields are parallel to the transmission axis of the material.

Initially, I bought a HF but my eyes were not comfortable with it and got tired after a few minutes.  I do not have that issue with the Ottlite.  But everyone's eyes are different.