Timeline for Why does shaking our hand result in more copies in dim light than in bright light?
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 24, 2021 at 18:57 | vote | accept | Vamsi Krishna | ||
| Jul 24, 2021 at 17:26 | answer | added | Ruslan | timeline score: 3 | |
| Jul 24, 2021 at 16:23 | comment | added | badjohn | @silverrahul I agree that this is probably more biology than physics. | |
| Jul 24, 2021 at 11:59 | comment | added | silverrahul | This does not just happen with A/C power. You can reproduce this in sunlight as well. This has more to do with the human vision system and how the brain interprets it, than about some principle of physics | |
| Jul 24, 2021 at 9:00 | history | tweeted | twitter.com/StackPhysics/status/1418858505742786562 | ||
| Jul 24, 2021 at 8:26 | comment | added | badjohn | So, being AC powered, the light is going on and off 100 or 120 times a second (maybe 50 or 60) depending on its design and your power supply. There is probably some fluorescent element in the bulb so that it dims but not fully go off. When it is bright, it might remain bright enough for our eyes the whole time and we see a blur. When it is dim, it might dip below our eyes' sensitivity and the hand is only visible at points in the cycle. | |
| Jul 24, 2021 at 8:12 | comment | added | Vamsi Krishna | @badjohn It was A/C powered | |
| Jul 24, 2021 at 7:54 | comment | added | badjohn | I just reproduced the effect now by waving my hand in front of the TV. | |
| Jul 24, 2021 at 7:53 | comment | added | badjohn | Battery or AC powered? I have seen the effect that you describe and I always guessed that it was a strobe effect due to the fluctuating power. The relevance of the brightness is probably related to the persistance of our vision. There is probably an optimal brightness for the effect. It might be more of a biology question. | |
| Jul 24, 2021 at 7:07 | comment | added | Vamsi Krishna | @badjohn I had bright(white) LED tubelight and and a dim (orange-yellow) LED bulb | |
| Jul 24, 2021 at 6:25 | comment | added | badjohn | What sort of light? Sunlight, a flame, electric lamp, etc? If you are using A/C powered artificial light then there may be a strobe effect. | |
| Jul 24, 2021 at 5:41 | comment | added | Ankit | @d_b it does.. and as OP mentioned it becomes clear in dimmer light but not brighter tho.. | |
| Jul 24, 2021 at 4:10 | comment | added | d_b | I wasn't familiar with this phenomenon, so I tried to reproduce it myself. Whether in bright or dim light, I was only able to see one copy of my hand at a time — no "facades." I am curious if you have any other accounts of people observing this. | |
| Jul 24, 2021 at 4:04 | history | edited | Vincent Thacker | CC BY-SA 4.0 |
remove m.wikipedia
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| Jul 23, 2021 at 18:41 | history | asked | Vamsi Krishna | CC BY-SA 4.0 |