Picture with polarized light

Physikfan, Sat Mar 31 2018, 04:38PM

The following picture, an advertisement for sunglasses with linear polarizers,
was photographed with a LUMIX DMC-FZ20.

OhnePolfilter400x297
First picture without polarizer

EVektor45GradzuryAchse400x285
second image: Polarizer, E-vector -45° to the Y-axis

EVektorparallelzurYAchse400x290
third image: Polarizer, E-vector parallel to the Y-axis, therefore 0°.

EVektorsenkrechtzuryAchse400x300
fourth image: Polarizer, E vector perpendicular to the Y axis, therefore 90°.

The second, third and fourth images were taken by using a linear polarizer,
wherein the polarizer position was fixed to the position of the subject.

I am looking forward to your comments.
Re: Picture with polarized light
Conundrum, Wed Apr 04 2018, 06:01PM

Interesting.
Did you see the infamous "entangled polarizers" effect with 3 of them?
Re: Picture with polarized light
AndreiRS, Thu Apr 05 2018, 01:13AM

It is curious, at least for me, how the background changed color on the last one, like in a kinda like a negative image. But the black lines still black.
Re: Picture with polarized light
Physikfan, Thu Apr 05 2018, 06:26PM

Hi Conundrum and AndreiRS

Ad Conundrum

Please, what do you mean with "infamous entangled polarizers"?

Ad AndreiRS

"how the background changed color on the last one"

Up to now I have no explanation for it but I will complete the series of pictures with one with the angle of +45°.

"But the black lines still black."

I think the black lines stem from black colour only.
Re: Picture with polarized light
Physikfan, Sat Apr 07 2018, 06:48PM

There is the picture with the electric field vektor of the polarization filter + 45 ° to the Y-axis of the subject:

EVektor135GradzuryAchse400x274

My next experiments will be that I take the subject through a circular polarizing filter.
Furthermore, I will not illuminate the subject with unpolarized light like now, but with linearly polarized light.