People can sense Earth’s magnetic field, brain waves suggest

submitted by useless_aether from sciencenews.org

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[–]useless_aether[S] 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (3 children)

i played with polarized foils and filters a bit, they are great to use in photography to filter out reflections from lights, on the water, to make the blue sky more saturated, even as a neutral density filter. i cant see it though, usually its just a moire.

[–]magnora7 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (2 children)

Yeah polarized filters are great for seeing reflective surfaces, because shallow reflections naturally polarize light in one direction. Pretty cool stuff

[–]Tom_Bombadil 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (1 child)

Polarized films can also be used to see areas of residual stress in clear plastics.

The stressed locations refract light at slightly differing angles, which allow the bent light to be filtered.

[–]magnora7 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

Yeah that is a very cool effect! It also brings to mind the rainbow in a puddle of oil on the ground in the rain, which refracts a rainbow of colors, the color depending on the thickness of the oil film on the water at that exact spot, which changes what frequencies are refracted and reflected. Light is so cool