Polarized Film Sheets 3 PCS 7.8x5.9in/ 20x15cm Polarizer Linear Polarizing Filter Non-Adhesive for Educational Physics Photography Lighting

Here's a simple STEM experiment that will defy most folks' predictions.Step 1. Attach first piece of the film to the window with painter's tape (see red rectangle in picture).Discuss how it blocks some of the incoming light, because light acts like a wave, and has an orientation.The film can be thought of as having vertical bars, and thus only the portion of the light that is aligned with those vertical bars makes it through. (For purposes of the experiment, describe the light that passes through as having "vertical" polarization.)Depending on the experimenters, you could draw a unit circle, and explain why ~50% of the light passes through the first sheet.Step 2. Temporarily place the second piece of the film at the same orientation as the first piece. Discuss why it doesn't block much more light. (the light that passed through the first piece was polarized vertically, so a second layer of "vertical bars" won't block much more.)Step 3. Slowly rotate that second piece of the film to the window until it's at a right-angle to the first (see blue rectangle in picture). Discuss why it's now blocking essentially all the light. (Light after first piece is all vertical, so there's no horizontal part to the light ... while the second sheet is now only allowing through the horizontal part, which is zero).Step 4. Tape that second piece as shown in the picture, making an "L" shape with the two pieces.Where the two pieces do not overlap, ~50% of the light will be passing through. Where the two pieces overlap, there will be ~0% light passing through.Step 5. Temporarily place the third piece of film on top of the other two pieces of film, as shown (green in picture). Discuss the amount of light that ends up passing through at each place.A. where 1st+3rd or 2nd+3rd films overlap: ~1/3 of the light is passing through (as expected)B. where 1st+2nd films overlap: ~0 of the light is passing through (as expected)C. where all three films overlap: ~0 of the light is passing through (as expected)So far, so good. Typical stuff that many high school physics classes have shown.This is where it will get WEIRD, and VERY non-intuitive results will occur.Step 6: Ask what folks to write down what they think will happen if, instead of the third film being layered on top, it was placed ***BETWEEN*** the first two films. Specifically, would the amount of light passing through anywhere change much vs. it being layered on top?Step 7: Slide the third film so it goes between ... and enjoy the expressions of bewilderment, curiosity, and disbelief!That's just AWESOME ... it's like a magic trick that takes no practice. It boggles the mind!Enjoy!

I use it for polarizing light coming out of lamps for photography. They work.Not the best quality you could expect, but for the money, they're decent.The polarizing effect is as expected.

These do work, but they let off an odd odor that also lingers on your hands after you touch them.

I disliked that the warehouse or packaging personnel do not understand that damaged filter are not of use. The damage is nearly in the middle of the filters (all 3 damaged). Polaroid filter is very thin.

These sheets work well for crossed polarization with my microscopes but they are not flat. They have a natural curl in them which is quite difficult to straighten

Pero está bien

I was really disappointed with the quality of these Polarized Film Sheets. They did not dim the light enough and were not useful for my educational purposes. The quality was very low and I would not recommend this product. There are probably better options out there for reducing glare and improving visibility. Save your money and look for a different product.

Im pretty sure I lost brain cells being in the same room as these polarizers