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# The Zen of Spin

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3/20/2015 5:30:58 PM
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:-)))

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3/20/2015 2:15:24 PM
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@DavidAshton: ... but my head is still spinning.....

Dave, is that +1/2 or - 1/2?  :-D

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Re: How Mirrors Work
3/19/2015 8:24:59 PM
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@wobbly True.  Then our interpretation is because we attempt to equal a reflection with a rotation (which can not work) and have the impression of "swapping".  Which way we think it got swapped depends upon which rotation we attempt to compare it to.

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Re: How Mirrors Work
3/19/2015 7:59:10 AM
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The mirror does not swap left for right, or up from down, it swaps front to back.

The wave front coming off the mirror is time reversed, most recent arrival to last. So you see the things closest to the mirror in front of the things farthest from the mirror.

Stand in front of a mirror, with your right hand raised, and slightly ahead of your face. You see the back of your right hand, to the right of you, with your palm facing away.

The mirror shows you the palm of your right hand, to the right of you (exactly where it is), with the back of your hand obscured and facing away. Swapped, front for back. Time reveresed, first arrival for last.

Another test is this. Get a laser transparency sheet, and print a single word in large block letters. Stand in front of the mirror holding the sheet so that the word faces the mirror. The reflected image from the mirror matches what you see looking through the transparency, at the printed word, from the back.

The mirror has again swapped front to back.

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Re: How Mirrors Work
3/18/2015 5:47:42 PM
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@mhrackin: I assume you do know that Mayim Bialek actually has her PhD in the same field as her character!

I met her at Design West a couple of years ago -- I have a pic of us together -- she's a nice lady -- in fact they changed the job description in her role to match her real-life degree -- and the added advantage is that she can advise them on the sort of equipment and experiments that would be/take place in a real lab.

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Re: How Mirrors Work
3/18/2015 3:05:49 PM
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@max: " as brilliant as Sheldon in "The Big Bang Theory" ... -- without the eccentricities, of course..."

Well, as the old song said, "...you can't have one without the other!"  I assume you do know that Mayim Bialek actually has her PhD in the same field as her character!  Not that I am implying she is eccentric....

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Re: How Mirrors Work
3/18/2015 1:18:23 PM
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@mhrackin: ...all this talk of "spin" and quantum-mechanical consequences was so named because that is what it did to your head!

I know what you mean -- it boggles my mind -- but I do wish I understood it in more detail -- every now and then I wish I was as brilliant as Sheldon in "The Big Bang Theory" (the character -- you know what I mean) -- without the eccentricities, of course.

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Re: How Mirrors Work
3/18/2015 1:15:53 PM
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@mhrackin: ...many of my friends were physics/astrophysics grad students...

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Re: How Mirrors Work
3/18/2015 1:11:42 PM
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@max: all this talk about spin, yoga, Zen, etc. reminds me of my grad school days.  A lot of this theory was just emerging back then; by an odd coincidence, many of my friends were physics/astrophysics grad students.  After many discussions long into the night, I understood that all this talk of "spin" and quantum-mechanical consequences was so named because that is what it did to your head!  It made me very thankful that I had decided in high-school that I was much more suited to a career in electronics than in physics, and likely much more employable!

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Re: How Mirrors Work
3/18/2015 1:00:25 PM
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@TanjB: There is no logical reason you could not have tipped upside down - but no-one normally thinks of doing that.

This triggered a thought from when I was a young lad -- every year we would go on a family holiday to the beach -- my mom, dad and me, and my aunt, uncle, and cousin.

My uncle was a brilliant artist -- he was also somewhet eccentric -- one year he was into yoga, and spend a large portion of each day standing on his head in the middle of the beach (that was quite helpful when it came to locating our family group on the beach when one came out of the sea).

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