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Old May 11th 2010, 05:52 AM   #1
kld
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What is it?

What is it?
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What is it?-obrazok-005.jpg   What is it?-obrazok-007.jpg   What is it?-obrazok-008.jpg  
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Old May 12th 2010, 10:08 PM   #2
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Could you be more specific as to what you want explained ? Or is this a puzzle for us?
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Old May 13th 2010, 10:41 AM   #3
kld
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I just want to know why I see something like that on my mirror or whatīs the name of this effect?
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Old May 15th 2010, 03:09 AM   #4
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It is nice to see that you are trying to find what it is. That is what science is all about isn't it?

Well I have a few inputs which may be wrong of course.

Firstly the wave like markings look rather periodic.

So it might be that somebody wiped the mirror and that has left a trace of some thing which reflects the light differently. To rule this out you could clean the mirror with ethyl alcohol or even isopropyl alcohol. If not readily available, scrub vertically downwards or horizontally with a slightly damp newspaper (this cleans pretty well). If it persists, we go to the next step

Remove the chime like article hanging in the centre of the pane above the door. It could be the light filtering thru small holes in it that causes this effect.

Take a convex lens and move it towards and away from the mirror and check what happens to the wave like structure. If you notice, the roof beyond has a periodic structure too

Years ago i found what i thought was an interference pattern on a wall when i opened the door very slightly. Good black and white lines running vertically. This puzzled me as i had been taught that one needed a mono chromatic coherent source and this was sunlight. When i collared my prof, he immediately said "you are seeing something else, investigate further".
So i did the lens thing and found that what i was actually seeing was the image of a concrete grill on the landing outside which consisted of circles and squares one below the other and these appeared in the pattern when the lens was introduced. What was happening was a sort of a "slit hole camera" rather like the well known pin hole one but with a slit in place of the hole!

Finally it could be something on the pane itself. So clean that too and check for any scratches .

Last edited by physicsquest; May 15th 2010 at 03:22 AM.
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Old May 15th 2010, 10:22 AM   #5
kld
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Thank you, I will try it
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Old May 18th 2010, 06:13 AM   #6
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Good and let us know the result please. I am looking forward to it.
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Old Sep 6th 2010, 05:59 AM   #7
kld
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(firstly, english is not my native language
Hi, I am sorry I didnīt answer earlier. I forgot about it and then I found out it was not there anymore, that was in june. But now it is there again (maybe position of the sun has something to do with it) and so I tried all the things you have advised me, but it is still there (And I noticed it can be seen on any part of the mirror but just from one side.)
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Old Sep 6th 2010, 11:06 PM   #8
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Sceince

This is science!!

The first and the second picture show that reflection of light.

The design on the mirror is actually the design of the mirror and you can call it a manufacturing fault. When light reflects on it, the design is viewed.
But as the dots are concerned, they the dust particles in the air that make image on the mirror.

Last edited by arbolis; Sep 7th 2010 at 07:56 AM.
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