PKG (4) 2" Square Linear Polarized Filter Slide has a 1-3/8” x 15/16” Window.

Some what fragile. Working with the sample piece, use a piece of white glass behind the bottom film then place sample piece on top of bottom film. Place top film in place and look through both films towards a light. You will have to work with the top piece until the films are in correct positions. If you see halos, the glass will not work together..

gift! Remote will control multiple TVs in the same room. But thats actually an issue sometimes. Putting these over the IR receiver alleviates that problem. Now the remote has to be pointed at the device... and prevents most errant signals from getting thru.

I expected the direction of polarization to be marked on the slide, but it's not. It's easy enough to figure out, but the oversight seems a little silly to me. If you're getting a number of these, be prepared to check the orientation of each one, as it's unknown whether the manufacturer always does them in the same way. Other than that, they worked fine for my intended use (double-slit experimentation).

I bought to do some little tricks for my kids who are learning about light and they show their friends. So great learning tool. Works perfectly for what I wanted.

These are good as a teaching tool and might be useful for some other applications, such as photography. Just be aware that they don't polarize near-infrared or ultraviolet light. (In fact, they don't even polarize violet light very well; if you cross two filters to block light and hold them up to a lamp, you'll see some violet light shine through.) I tried to use these to limit interference between a remote control for my PC and a TV that kept turning off when I used it. The idea was to tape one filter in front of the remote control's infrared LED, another in front of the TV's remote sensor, and rotate the two filters to block the infrared light. But checking with a cell phone camera, I discovered that the infrared light from the remote came right through, no matter how I rotated the filters. Oh, well; nice idea, but no banana....

Perfect for demonstrating the polarization property of light. Place two of these against each other and slowly rotate one relative to the other until the rotation reaches 90 degrees. The light that passes through slowly darkens. When you reach 90 degrees, no light pass through, because between the two filters, light at every polarization angle is blocked.

Mine arrived already scratched. You'll get better quality repurposing one of the disposable 3D glasses you get at the movie theatre.

I guess you get what you pay for ¯\_(ツ)_/¯

偏光フィルターです。 サイズは小さいですが、ふち付きなのが有難い。

大きなレンズ型の偏光版でなくてもフィルムの大きさで偏光版の重ね合わせや，偏光の性質を知るのに気軽に実験できて学生実験に最適です。

iPhoneのカメラで分光画像を撮影する時、明るい光源の場合には、露出がオーバーになり、分光強度値が255近くに張り付きプロットがうまくいきませんでした。そこで、カメラが露出オーバーにならないように2枚の偏光板を回転させ透過光強度を調整できる調光器を作って、1000本/mm 回折格子シートを使った 透過型簡易分光器の前に取り付けてみました。直射日光以外の通常の光源ではかなりうまく撮影できるようになりました。