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Mirror Trivia Question #4594726
12/05/17 08:26 AM
12/05/17 08:26 AM
Joined: Sep 2017
Posts: 307
One Step Beyond
MasterSolenoid Offline OP
MasterSolenoid  Offline OP
Joined: Sep 2017
Posts: 307
One Step Beyond
Happy Holidays to all.
Here is a little mirror trivia to think about.

Lets say your standing 5 ft from a large mirror.
You see the image size of yourself as;
Question: Other people would see you from a distance of 5 ft OR 10 ft ? ? ?

Please answer and explain.

I say if your standing 5 ft from a mirror, your 'image size' would be the same as someone seeing you from a distance of 10 ft.
I can't find the words to explain.


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Re: Mirror Trivia Question [Re: MasterSolenoid] #4594774
12/05/17 09:07 AM
12/05/17 09:07 AM
Joined: Dec 2016
Posts: 7,132
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,132
Waco, TX
Originally Posted By: MasterSolenoid

I say if your standing 5 ft from a mirror, your 'image size' would be the same as someone seeing you from a distance of 10 ft.
I can't find the words to explain.


It's 2X the visual depth.


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Re: Mirror Trivia Question [Re: MasterSolenoid] #4594780
12/05/17 09:13 AM
12/05/17 09:13 AM
Joined: Feb 2016
Posts: 686
NJ, USA
MotoTribologist Offline
MotoTribologist  Offline
Joined: Feb 2016
Posts: 686
NJ, USA
I've never thought about this before and I have no idea if I am correct but.....

The light emitted from your body at a distance of 5 feet would be directly reflected back at you from that distance, so the mirror does reflect your image's appearance from 5 feet. Since we have binocular vision, when we focus on a single point, the light converges to a single point. The further the object is away from us, the light converges more gradually and appears to a finer (smaller) point.

However when an object is reflected, that convergence is reversed. The light from an object flips from one side to the other since our eyes are side-by-side. (I believe if our eyes were oriented vertically instead of horizontally, mirrors would display images upside down rather than reversed side to side). So rather than converging, the light diverges once it is reflected and expands again to the viewing point.

The fact that we don't see out of the center of our bodies has an effect too. Our feet appear further than our eyes do because of how far that light must travel before our eyes collect it.

Re: Mirror Trivia Question [Re: MasterSolenoid] #4594784
12/05/17 09:16 AM
12/05/17 09:16 AM
Joined: Dec 2014
Posts: 1,684
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,684
'murica
I can't parse your spelling and grammar.

Re: Mirror Trivia Question [Re: MasterSolenoid] #4594899
12/05/17 11:33 AM
12/05/17 11:33 AM
Joined: Oct 2010
Posts: 9,123
Virginia Beach
Astro14 Offline
Astro14  Offline
Joined: Oct 2010
Posts: 9,123
Virginia Beach
The term you’re looking for is apparent size.

If you’re 5 feet from the mirror, you’ll see yourself at the apparent size as viewed from ten feet.


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Re: Mirror Trivia Question [Re: MasterSolenoid] #4594916
12/05/17 11:43 AM
12/05/17 11:43 AM
Joined: Jun 2002
Posts: 12,642
The Motor City
Kestas Offline
Kestas  Offline
Joined: Jun 2002
Posts: 12,642
The Motor City
In my experience, my camera would focus at a distance of 10'.

Re: Mirror Trivia Question [Re: MasterSolenoid] #4594923
12/05/17 11:48 AM
12/05/17 11:48 AM
Joined: Sep 2015
Posts: 1,592
USA
mk378 Online content
mk378  Online Content
Joined: Sep 2015
Posts: 1,592
USA
Also the minimum size of the mirror required to see your entire body at once is half of your actual height and width. This is true no matter how far away you are from the mirror.

Re: Mirror Trivia Question [Re: MasterSolenoid] #4594930
12/05/17 11:52 AM
12/05/17 11:52 AM
Joined: Nov 2015
Posts: 840
US
bunnspecial Offline
bunnspecial  Offline
Joined: Nov 2015
Posts: 840
US
Here's an experiment I was told to try when I first took up photography and had my first SLR. I went to the bathroom mirror, stuck a piece of paper on it, focused on this(manual focus, but it will work with any type of passive AF camera) and noted the distance. I then focused on the image of myself in the mirror and noted the distance. It was indeed twice that of the mirror itself.

So, I'll go with the image to someone else appears as if you're standing twice the actual distance from the mirror.


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Re: Mirror Trivia Question [Re: MasterSolenoid] #4595022
12/05/17 01:46 PM
12/05/17 01:46 PM
Joined: Feb 2016
Posts: 686
NJ, USA
MotoTribologist Offline
MotoTribologist  Offline
Joined: Feb 2016
Posts: 686
NJ, USA
In that case I retract my initial explanation of nonsensical whimsy. happy

and here is a simple graphic to explain it:


Re: Mirror Trivia Question [Re: MasterSolenoid] #4595065
12/05/17 02:10 PM
12/05/17 02:10 PM
Joined: Jun 2005
Posts: 11,612
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,612
Santa Barbara, CA
Better mirror trivia is the first use of a rear view mirror on a car was by Ray Harroun on the 1911 Indianapolis 500 winning Marmom Wasp. Every other car had a ride on mechanic to tell the driver about any cars coming up behind.


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Re: Mirror Trivia Question [Re: MasterSolenoid] #4595070
12/05/17 02:13 PM
12/05/17 02:13 PM
Joined: Dec 2002
Posts: 41,532
'Stralia
Shannow Online content
Shannow  Online Content
Joined: Dec 2002
Posts: 41,532
'Stralia
Nice little brainteaser for a Wednesday morning...and my first impressions were wrong.

Re: Mirror Trivia Question [Re: MasterSolenoid] #4595186
12/05/17 03:39 PM
12/05/17 03:39 PM
Joined: Jun 2002
Posts: 12,642
The Motor City
Kestas Offline
Kestas  Offline
Joined: Jun 2002
Posts: 12,642
The Motor City
I have a better one... it's been used for new engineer interviews.

When you look at a mirror, why does the image flip left-to-right, but not top-to-bottom?

Re: Mirror Trivia Question [Re: Kestas] #4595206
12/05/17 03:51 PM
12/05/17 03:51 PM
Joined: Dec 2005
Posts: 10,284
Upper Midwest
kschachn Online content
kschachn  Online Content
Joined: Dec 2005
Posts: 10,284
Upper Midwest
Originally Posted By: Kestas
I have a better one... it's been used for new engineer interviews.

When you look at a mirror, why does the image flip left-to-right, but not top-to-bottom?

That's a trick question which my high school physics teacher once asked our class wink


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Re: Mirror Trivia Question [Re: Kestas] #4595214
12/05/17 03:55 PM
12/05/17 03:55 PM
Joined: Jun 2003
Posts: 10,534
Illinois
javacontour Offline
javacontour  Offline
Joined: Jun 2003
Posts: 10,534
Illinois
I'll take a stab at it.

It's not really that the image is reversed right and left. It's your perspective.

Think of your mirror this way, it is a piece of glass that your image is drawn upon.

Get a grease marker and write your name on the outside of a window. Then go inside and read what you wrote. It will read right to left even though (assuming English, western left to right writing here) you wrote it left to right.

What you view in the mirror is essentially your image from the other side of the glass. You are looking at yourself "from behind" so to speak. In same fashion as the grease pencil example above, your image will appear reversed left to right and right to left.


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