Does this effect have a name? I'm specifically referencing the iridescent shapes to the lower left of the apple
My clear case against the glass back of my work phone creates this light effect, what am I looking at?
18 days ago by FUCKING_CUNO to c/askscience
FUCKING_CUNO 20 points 18 days ago
I think youre bang on with the Newtons Rings, thanks!
CmdrShepard49 9 points 17 days ago
Amusing that this too involves an apple.
thenextguy 12 points 18 days ago
When a grid's misaligned with another behinnd, that's a moiré
Onomatopoeia 12 points 18 days ago
Incorrect, but I'm giving you the upvote for the lyrical answer
SaveTheTuaHawk 6 points 18 days ago
Moire patterns do not cause a prism effect with light.
Lauchmelder 9 points 18 days ago
thin film interference
JayleneSlide 7 points 18 days ago
It's called moiré, a form of interference pattern: https://en.wikipedia.org/wiki/Moir%C3%A9_pattern
Edit: not moirè, but rather a form of diffraction grating interference because of the minute differences in distance between the two surfaces.
It is also the why DVDs and CDs have rainbow reflections.
sunnie 12 points 18 days ago
CDs and DVDs have rainbow reflections because the “parallel” (parallel on the scale of the wavelength of light) rows of pits create a diffraction grating.
The rings in the picture are Newton’s Rings, as pointed out in comments. There are a different set of rings for each wavelength of light and since they don’t all line up you get this rainbow effect.
Lucidlethargy 1 point 17 days ago
I wonder if it's a polarization effect. Look at it with polarized sunglasses on.
Dookieman12 -7 points 18 days ago
I don't know what it's called, but I can tell you it's caused by air being trapped underneath the screen protector. Whoever put it on didn't know to start in the middle and apply pressure outward so you can wipe bubbles toward the edge to remove them.
Or, they were doing a hundred of them and knew they wouldn't have to look at any of them again, so they just threw it on there as fast as they could.
SaveTheTuaHawk 8 points 18 days ago
This happens with any layered glass with a change in refractive index, cause by a layer of plastic or glue. You can see this on car windows at the right angle because they are layered glass and plastic.
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It's not moire...
These are Newtons rings, a different type of optical interference pattern.
It occurs when two transparent sources reflect light in contact.
You get it frequently when trying to scan transparencies using a flatbed scanner too.
Here: Newtons Rings Wikipedia
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