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# The Blackhole of a CD-ROM...

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posted on Mar, 29 2012 @ 02:17 AM
Has anybody ever held up a CD or DVD to the sunlight and seen the reflection it creates on a wall? The brightest part of the reflection is the hole in the middle of the CD/DVD. That part is full of light. So why does light show up there? The entire CD gets reflected with light but the hole becomes the brightest. Something to do with the angle? Refraction? What's the deal? Anybody know what I'm talking about?

posted on Mar, 29 2012 @ 02:27 AM

got a picture ?

posted on Mar, 29 2012 @ 02:39 AM

It's bright because it's a hole and sunlight is coming through it?

posted on Mar, 29 2012 @ 02:39 AM
This is the closest thing I could find... astro.u-strasbg.fr...

Looks like it's just half of a CD in the picture, but this is kinda what I'm talking about...

posted on Mar, 29 2012 @ 02:47 AM

The brightest part of the reflection is the hole in the middle of the CD/DVD.

in the picture, the hole is dark.

posted on Mar, 29 2012 @ 02:49 AM

It's bright because it's a hole and sunlight is coming through it?

Thats what she said........

posted on Mar, 29 2012 @ 02:56 AM
The hole becomes lit because refracted light simply disperses

No mystery, no magic trick

posted on Mar, 29 2012 @ 03:04 AM

Yeah it's not a very good picture. The hole should be filled............

with light...

heh

posted on Mar, 29 2012 @ 03:08 AM

Originally posted by jesiaha
The hole becomes lit because refracted light simply disperses

No mystery, no magic trick

Disperses into the middle? Is it just because it is round or would a CD with a rectangle hole produce the same result?

posted on Mar, 29 2012 @ 03:09 AM

Originally posted by Nurelic

Originally posted by jesiaha
The hole becomes lit because refracted light simply disperses

No mystery, no magic trick

Disperses into the middle? Is it just because it is round or would a CD with a rectangle hole produce the same result?

I'm guessing yes

posted on Mar, 29 2012 @ 05:47 AM

Originally posted by jesiaha
The hole becomes lit because refracted light simply disperses

No mystery, no magic trick

I personally think the "blackhole" of a CD-Rom is created by ancient aliens, you really should not listen to everything those scientists say.

posted on Mar, 29 2012 @ 05:52 AM
With a mirror the angle of incidence of light equals the angle of reflection, basically perfectly. That's why you get a perfect image reflected back at you.

While a CD/DVD is very shiny, it's not a perfect mirror. The angle of incidence isn't always going to equal the angle of reflection for every particle of light. A lot of it scatters, which is why instead of a perfect reflection of the disc being bounced onto a wall or whatever, you get a blurry version of the same shape, blurry enough to "fill in" the hole. I just tried it myself with a random DVD-ROM I had lying around. Got a blurry disc shaped reflection on my wall.

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