Several years ago, I was laying on my bed and had a CD shaped transparent plastic disk (which was covering a 100 CD stack), basically a transparent CD. I don't know why but I took my phone and took a picture of the light bulb in my room through the hole of that plastic disk. Here is the result:
Why does it appear like that? does it have anything to do with Thin-film interference? And would it look the same if there was no hole in the middle?
Answer
You are looking through a CD? (with lots of grooves). I believe what you made is a transmission diffraction grating.
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