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Q&A

Posts tagged light

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Q&A Why can someone observe light, even when the light fails to illume that someone?

I never grokked the optics behind LightHouses and the WW2 poster below work. LightHouse beams are narrow and focussed. Doubtless, the light source can fail to illumine a seafarer or the enemy subm...

1 answer  ·  posted 11mo ago by TextKit‭  ·  last activity 11mo ago by Olin Lathrop‭

Question light
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Q&A Why do markers reflect light, even when the light source fails to illumine the space between the source and markers?

Please see below screenshot of 15:59.The LED spot light (fastened to the front of the boat) illumines merely a few meters in front, and fails to illumine most of the water between the boat and the...

1 answer  ·  posted 11mo ago by TextKit‭  ·  last activity 11mo ago by Olin Lathrop‭

Question light
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Q&A Conductivity with angle of light

In the lab I changed the angle the light hits a photoresistor and it doesnt obey Lambert's cosine law the conductivity of the photoresistor drops fast from +-20 to +-30 degrees angle.Why?

1 answer  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by Olin Lathrop‭

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Q&A Are lamps, with blistering light bulbs exposed and facing down on the user, dangersome?

IKEA discontinued this NOVEMBER lamp in 2007, but I still use it. IKEA confirmed that they did not intend or design any cover or share with this lamp, and the light bulb is supposed to be exposed. ...

2 answers  ·  posted 1y ago by TextKit‭  ·  last activity 1y ago by celtschk‭

Question light
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Q&A How can I turn a floor lamp, that lights upward, into a reading light? [closed]

How can I turn this floor lamp into a reading light? I want all light exiting upwards from the lamp shade to point down. Do I just buy a mirror and put it on top of the lamp shade? Then the mirror...

0 answers  ·  posted 2y ago by TextKit‭  ·  edited 1y ago by TextKit‭

Question light

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