TIL Lighthouses had different techniques for rotating the light, most being too slow, making the light less visible. Augustin Fresnel proposed a mercury flotation system in 1825. Despite some lenses weighing over 6,000 lbs. the design reduced friction, increased rotation, and ultimately saved lives. uslhs.org/lens-rotation
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πŸ“°︎ r/todayilearned
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πŸ‘€︎ u/SlothSpeed
πŸ“…︎ Feb 18 2021
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Visible light produced by a meteor. v.redd.it/e07ed3rx51h61
πŸ‘︎ 35k
πŸ“°︎ r/ThatsInsane
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πŸ‘€︎ u/swat_08
πŸ“…︎ Feb 12 2021
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Applying sunscreen, a visible-light vs. UV-light comparison
πŸ‘︎ 41k
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πŸ‘€︎ u/__Dawn__Amber__
πŸ“…︎ Dec 29 2020
🚨︎ report
TIL the human body literally glows, emitting a visible light in extremely small quantities at levels that rise and fall with the day, scientists now reveal. Past research has shown that the body emits visible light, 1,000 times less intense than the levels to which our naked eyes are sensitive. nbcnews.com/id/wbna320909…
πŸ‘︎ 5k
πŸ“°︎ r/todayilearned
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πŸ‘€︎ u/AbhigyanKumar
πŸ“…︎ Feb 06 2021
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**NLD** Weltool M2-BF. Both pics taken with my bedroom light on. This has almost zero visible light. Pretty damn cool.
πŸ‘︎ 280
πŸ“°︎ r/flashlight
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πŸ‘€︎ u/JNader56
πŸ“…︎ Mar 08 2021
🚨︎ report
Beyond invisibility: multiple research groups have made metamaterials that work in the infrared; some are skirting the fringe of the visible portion of the spectrum. A group in Germany has created a thermal cloak, preventing an area from heating – just as an invisibility cloak bends light. ponderwall.com/index.php/…
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πŸ“°︎ r/Physics
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πŸ‘€︎ u/avandoorslaer
πŸ“…︎ Mar 08 2021
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Tallinn was visible from Helsinki on Monday (1st March) night due to extremely clear atmosphere that caused light beam deformations and refractions.
πŸ‘︎ 587
πŸ“°︎ r/BalticStates
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πŸ‘€︎ u/daniusas
πŸ“…︎ Mar 03 2021
🚨︎ report
In The Descent (2005), at about 25 mins in, the group light a red flare in a wide shot. To the left, you can see a small monitor from the camera crew who will film the subsequent, closer shots for the sequence. It's visible right before the flare is lit until the scene cuts.
πŸ‘︎ 376
πŸ“°︎ r/MovieMistakes
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πŸ‘€︎ u/JoshuaCalledMe
πŸ“…︎ Mar 06 2021
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Visible light produced by a meteor. v.redd.it/0ykbso7ve3h61
πŸ‘︎ 2k
πŸ“°︎ r/nextfuckinglevel
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πŸ‘€︎ u/Megapopeye
πŸ“…︎ Feb 12 2021
🚨︎ report
Walk the visible spectrum of light v.redd.it/t4l89r8bptg61
πŸ‘︎ 2k
πŸ“°︎ r/physicsgifs
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πŸ‘€︎ u/just-some-name
πŸ“…︎ Feb 11 2021
🚨︎ report
Why are the people in Lakewood like this? Not Visible: The small sedan in the oncoming lane that had been waiting patiently to turn left, and then didn't get to because this asshead pulled out at the very last possible second and blocked the intersection. Light turned red before anyone got to go.
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πŸ“°︎ r/newjersey
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πŸ‘€︎ u/Zingeronix
πŸ“…︎ Mar 11 2021
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I have a rl useless power, I can see non-visible light but it hurts and i cant see pee under blacklight and it literally does nothing else
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πŸ‘€︎ u/Early-Time
πŸ“…︎ Feb 22 2021
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I was visiting up north with my family in Ashland Wisconsin taking a picture of Lake Superior from our hotel room. I β€œaccidentally” got a view of the northern lights. Wasn’t visible with the naked eye but my camera magically caught it on the IPhone 11. I’m back at home in Appleton still confused.
πŸ‘︎ 161
πŸ“°︎ r/wisconsin
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πŸ‘€︎ u/trent420024
πŸ“…︎ Mar 07 2021
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Can a super-efficient incandescent light-bulb be created by coating it with infra and UV reflective coating, that lets out only visible light.

The idea is that IR and UV is reflected back on the filament, so only useful light can escape.

πŸ‘︎ 42
πŸ“°︎ r/AskPhysics
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πŸ‘€︎ u/mzso
πŸ“…︎ Feb 27 2021
🚨︎ report
Ships of the US fleet at Ulithi Atoll, Caroline Islands, 8 Feb 1945. Visible are 7 large carriers, 3 light carriers, 3 battleships, and numerous cruisers, destroyers, and support vessels including 1 hospital ship. (2176x1709)
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πŸ“°︎ r/WarshipPorn
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πŸ‘€︎ u/abt137
πŸ“…︎ Feb 17 2021
🚨︎ report
The importance of applying sunblock, a visible-light/UV-light comparison
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πŸ“°︎ r/gifs
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πŸ‘€︎ u/Keerikkadan91
πŸ“…︎ Feb 02 2021
🚨︎ report
Anyone know why characters’ Visions will pulse with light at times, even if not using their powers? In the video I took, both Kaeya & Sucrose’s Visions are glowing, with no visible cause. v.redd.it/f60eaofhiam61
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πŸ“°︎ r/Genshin_Lore
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πŸ‘€︎ u/Genshin_Addict
πŸ“…︎ Mar 11 2021
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[WP] One day you wake up only to find you are completely blind. In panic, you reach for your phone and its screen lights up. Only your phone screen is visible. Everything else is complete darkness.
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πŸ“°︎ r/WritingPrompts
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πŸ‘€︎ u/hectots
πŸ“…︎ Feb 22 2021
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The snow-covered Himalayan Mountains and the bright city lights of New Delhi, India, and Lahore, Pakistan, are also visible below the faint, orange airglow of atmospheric particles reacting to solar radiation, taken from the International Space Station.
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πŸ“°︎ r/spaceporn
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πŸ“…︎ Dec 16 2020
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Glendronach cheatsheet. In reference to myballs post, the 2019 bottling of the 18 puts the liquid at about a 24 year age statement. Best bang for the buck. You can see the laser code on the back blow the label. Kinda hard to see but in the right light it is visible.
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πŸ‘€︎ u/YP42
πŸ“…︎ Mar 10 2021
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Lmk if I’m fucked. Anybody know what this is seems internal way more visible with light coming through.. hoping this is what nute burn looks like up close and not a mold 🀞🀞🀞
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πŸ“°︎ r/microgrowery
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πŸ‘€︎ u/__Waterboy
πŸ“…︎ Mar 11 2021
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Mandala fox from a kit I got for Christmas. First time using thread to cinch the fabric in a circle behind the frame... but how do I make it not visible?? I used dark green felt to cover the back, should I have used a light color? Help me collective knowledge of reddit!! reddit.com/gallery/lttyx7
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πŸ“°︎ r/Embroidery
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πŸ‘€︎ u/tlynnecook
πŸ“…︎ Feb 27 2021
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Holo scratch question. I have several holos with scratching like this, but with NO other errors, including whitening. This is only visible under direct, focused light. What’s the grade damage?
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πŸ‘€︎ u/tor09
πŸ“…︎ Mar 04 2021
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Issue after updating to OOS11. I noticed that when using front camera, there is no longer any black trim displayed around the fron camera like on OOS10, and this results in screen light being visible while using wide angle camera, sometimes visible even with normal front camera
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πŸ“°︎ r/oneplusnord
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πŸ‘€︎ u/verpejas
πŸ“…︎ Mar 06 2021
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Is it posible to have two invisible light beams combine and form a visible spot on the wall? (to the naked human eye at least)

Hello guys,

Let me try to be more clear on my question. With invisible light beam i mean a light with a waveform not in the visible spectrum of human eyes, could be infrared or ultraviolet not dangerous to us, but when combined with other light beam that has a slightly different waveform make a visible spot in a wall or in a surface they hit.

One light by itself of course wont be visible to us. But is there any combination of short/long wavelenght lights that when combined become visible to the human eye? If you guys imagine it as laser lights it might make more sense.

I made a crappy drawing but it might help me explain more.

here is the link: https://imgur.com/I8R8K19

Thanks a lot in advance!!!

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πŸ“°︎ r/askscience
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πŸ‘€︎ u/InformalAttempt9
πŸ“…︎ Mar 03 2021
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Beautiful Weather. Column backgrounds change as weather changes. Bonus: hidden rain chart, only visible when due. Light/Dark mode. Swipe for QR. reddit.com/gallery/krm0e5
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πŸ“°︎ r/widgy
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πŸ‘€︎ u/ElijahBailey-
πŸ“…︎ Jan 06 2021
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FF VIII Discs 2 & 3 Respectively (They are under a direct light, so not always this visible) reddit.com/gallery/li1art
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πŸ“°︎ r/psx
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πŸ‘€︎ u/nik0121
πŸ“…︎ Feb 12 2021
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There are only 4 colours in the visible light spectrum.
πŸ‘︎ 18k
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πŸ“…︎ Oct 18 2020
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TIL about structural coloration, the production of colour by microscopically structured surfaces fine enough to interfere with visible light. Peacock feathers are actually pigmented brown! magazine.scienceconnected…
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πŸ“°︎ r/todayilearned
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πŸ‘€︎ u/plaidman42
πŸ“…︎ Feb 06 2021
🚨︎ report
Day 4 of foam yellowing my DS LJR OW AJ1. Placed the UV light inside 1 pair of the shoe. Noticeable yellowing after 8-10hrs. Visible results in comparison pics. reddit.com/gallery/l8cqq2
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πŸ“°︎ r/Repsneakers
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πŸ‘€︎ u/bigfootac
πŸ“…︎ Jan 30 2021
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TIL the last bursts of light in the universe will not be visible from any of the other last remaining stars. The distances will be so large that the photons will decay before crossing them. popularmechanics.com/spac…
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πŸ“°︎ r/todayilearned
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πŸ‘€︎ u/LeoSolaris
πŸ“…︎ Dec 02 2020
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ngl I kinda miss when the cybertruck not having visible police lights so you could go undercover
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πŸ“°︎ r/robloxjailbreak
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πŸ‘€︎ u/Flight_TeamCrew
πŸ“…︎ Mar 04 2021
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Northern Lights visible tonight through Friday night! Any suggestions on less light polluted places to check them out?
πŸ‘︎ 823
πŸ“°︎ r/Minneapolis
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πŸ‘€︎ u/Kaleighawesome
πŸ“…︎ Dec 09 2020
🚨︎ report
Hi guys, does anyone know the name of this issue? It’s an almost white light in the same place on the screen. It is always there but mostly visible where the screen is dark
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πŸ“°︎ r/crtgaming
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πŸ‘€︎ u/lager778
πŸ“…︎ Feb 28 2021
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Pls fix. You can clearly see that only the guys shoulder lights are visible + desync v.redd.it/xxy5sr40e2861
πŸ‘︎ 317
πŸ“°︎ r/CallOfDutyMobile
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πŸ‘€︎ u/ToxicHaze150
πŸ“…︎ Dec 29 2020
🚨︎ report
If we could perceive waves like infrared and UV like we do with visible light, how different would our surroundings look?
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πŸ‘€︎ u/SirZbear
πŸ“…︎ Mar 11 2021
🚨︎ report
Despite adjusting the sun size and light bounces to 'direct lighting', my renders still don't match the look I want as visible on the viewport. Any advice? reddit.com/gallery/lng16b
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πŸ“°︎ r/blenderhelp
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πŸ‘€︎ u/sinlesscelerysfm
πŸ“…︎ Feb 19 2021
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Lagoon Nebula in visible and infrared light (Credit: NASA, ESA, and STScI)
πŸ‘︎ 5k
πŸ“°︎ r/spaceporn
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πŸ‘€︎ u/R93murph
πŸ“…︎ Nov 27 2020
🚨︎ report
Do you see the cyclist? I almost didn’t. Get some lights and be visible my non motored road friends.
πŸ‘︎ 189
πŸ“°︎ r/VictoriaBC
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πŸ‘€︎ u/Flipgary
πŸ“…︎ Dec 16 2020
🚨︎ report
Is this contam?? After the first flush it dumped spores on the cake so there was visible dark spots but then these light orange/pink circles started popping up. No smell. What should I do?
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πŸ“°︎ r/shroomers
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πŸ‘€︎ u/ThatsMyCologist
πŸ“…︎ Feb 05 2021
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Rhode Island in Visible Light reddit.com/gallery/l4dqyy
πŸ‘︎ 242
πŸ“°︎ r/RhodeIsland
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πŸ‘€︎ u/satish1986
πŸ“…︎ Jan 25 2021
🚨︎ report
Lighthouse on a cliff (west coast of the Ocean). Unpainted and de-actuated version on page 4. Keep in mind that the light effect is inconsistent because it is achieved with fog machines (visible on the far left and right sides 50% of the time). reddit.com/gallery/laakuk
πŸ‘︎ 45
πŸ“°︎ r/Terraria
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πŸ‘€︎ u/TerraMonolith
πŸ“…︎ Feb 01 2021
🚨︎ report
55+ct Pink/Champagne Topaz. Nearly flawless with a 10x visible crystal in crown. Watch whole video for multiple lights! $2200 v.redd.it/mm0zfpzebz761
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πŸ‘€︎ u/shinyprecious
πŸ“…︎ Dec 28 2020
🚨︎ report
38 Male 5'10" 210 Lbs - Does my palm look normal? I never noticed the white patches before. I see them better under different light. Most visible with my arms at my sides

Sorry I couldn't get my image to post directly.

https://imgur.com/a/7v1ElIM

πŸ‘︎ 2
πŸ“°︎ r/AskDocs
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πŸ‘€︎ u/DATNOTMEe
πŸ“…︎ Mar 09 2021
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These lights were visible all over the sky yesterday. These are light pillars, caused by little ice crystals in the air that reflect the light of the light sources on the ground
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πŸ“°︎ r/ARKone
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πŸ‘€︎ u/DR_Dapper__
πŸ“…︎ Feb 01 2021
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Radiant Northern Lights could be visible over the Midwest tonight timeout.com/chicago/news/…
πŸ‘︎ 440
πŸ“°︎ r/chicago
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πŸ‘€︎ u/cjstudent40k
πŸ“…︎ Dec 09 2020
🚨︎ report
There's a geomagnetic storm (aurora) visible in Michigan the next 3 nights and I wanted to see how far I'd have to drive to see it. Anyway, here's a light pollution map of Southeast Michigan that I thought I'd share if anyone else is interested.
πŸ‘︎ 381
πŸ“°︎ r/Detroit
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πŸ‘€︎ u/Stratiform
πŸ“…︎ Dec 10 2020
🚨︎ report
Quick question about visible distances for light sources

So I'm a long time player of the mod, and I'm just starting to get back into the standalone now because it seems to be in a much better place. I've been playing on the first person official servers and holy crap the nights are dark.

In the mod flashlights and flares could be seen from basically an infinite distance but chemlights and the red tactical torch couldn't be seen past a certain distance (I think it was like 55m or something). Are there similar limits visual limits for light sources on the standalone or am I lighting myself up like an xmas tree every time I use a chemlight?

πŸ‘︎ 5
πŸ“°︎ r/dayz
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πŸ‘€︎ u/IHOP_007
πŸ“…︎ Mar 09 2021
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