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They do it with mirrors (Posted on 2006-04-26) Difficulty: 3 of 5
If I stand in front of a mirror, the light takes a finite, albeit small, amount of time to reach my eye.

So I am seeing myself as I looked some small fraction of time in the past.

Now if I stand with a second mirror behind me, I can see an infinite number of images of myself, each slightly older.

If I had my arm raised, and then I lowered it, can I still see an image of myself with raised arm?

No Solution Yet Submitted by goFish    
Rating: 3.7500 (4 votes)

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The Space Race Comment 8 of 8 |

I remember as a child seeing a conference between ground control and one of the astronauts. There was some feedback so that a mirroring effect occurred, slowed down by distance and (probably) the technology used. The result was that the reflections multiplied at a rate slow enough to be seen. Obviously, if that is true, then a small movement could be captured as required.

So the answer is 'yes' depending on one's interpretation of the word 'mirror'.

  Posted by broll on 2016-01-16 00:32:18
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