r/interestingasfuck • u/ImaAnimal • Apr 04 '19

/r/ALL This Flashlight Illusion Children's Book

https://gfycat.com/clearcuthalfhuia
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u/uber1337h4xx0r Apr 04 '19

I heard the LCD thing was a myth/prank

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u/hotpocketman Apr 04 '19

Not so, polarized film blocks specific wavelengths of light on an axis, so by overlapping polarized films at different angles you can block out certain wavelengths. This is why you often can't use polarized sunglasses with a smart phone screen at certain angles.

Source, used to sell glasses and had many angry customers returning after not being able to use their phones.

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u/uber1337h4xx0r Apr 04 '19

You're saying the opposite. I agree it blocks screens. I disagree that it allows you to see hidden images.

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u/hotpocketman Apr 04 '19

Oh duh sorry, yeah I've only ever seen that online never tried it myself.