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As Magneto has control of magnetism, can he create darkness? Light itself is an electromagnetic wave, and eliminating the magnetic part of light might cause it to be “invisible” to the human eye.

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"eliminating the magnetic part of light might cause it be "invisible" to the human eye" - uh WUT? That is unscientific even in DC physics. –  DVK Feb 19 at 16:17
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Most of the electromagnetic spectrum is invisible to the human eye, the visible part of light is a very small compared to the rest of the spectrum which may include microwaves, x-rays and so on. –  user15235 Feb 19 at 16:58
    
"Unscientific in DC physics"... I'm just unable to parse this. We must consider the possibility that user23024 is a Marvel comic writer who has come here just to screw with us all. –  John O Feb 20 at 1:14
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4 Answers 4

First of all, you can't "eliminate the 'magenetic' part of light". That's not how physics works. You can ask on Physics.SE for extended details. Having said that, light is an electromagnetic phenomenon, and as such can be manipulated by Magneto according to canon:

He can also generate electromagnetic pulses of great strength and generate and manipulate electromagnetic energy down to photons. He can turn invisible by warping visible light around his body.[93] - via Wikipedia, with ukltimate source Vision and the Scarlet Witch #4 (February 1983)

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The short answer is yes. In the comic-book canon, Magneto demonstrates a wide range of powers that aren't seen in the films including a force-field strong enough to block the she-hulk and the ability to fly (whereas he only has the ability to influence metal in the films).

In "Vision and the Scarlet Witch : Vol 1 #4" we see him 'wrapping himself in a cocoon of metal' which he then uses to bend light around him;

Magneto invisible

The same cocoon apparently allows him to 'traverse vast distances of empty space' without a space suit.

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It's curious that the cloak seems to block sound too, since that's not an electromagnetic phenomenon. –  Bobson Feb 19 at 19:17
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@Bobson - Pointing out obvious flaws in comics is like shooting fish in a barrel –  Richard Feb 19 at 19:46
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It's true - it just makes you wonder where the line between "I'm using my magnetic powers to become invisible" and "I have a separate power to become perfectly stealthy" is. –  Bobson Feb 19 at 21:43
    
@Bobson - If someone walked past me that I couldn't see, I'd be inclined to believe they were invisible, regardless of how they'd achieved it –  Richard Feb 19 at 22:16
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Sort of. Maybe.

If we assume some semblance of physics as we currently know it, then Magneto cannot "create darkness", because darkness is not a "thing" one "creates". But he could prevent light from entering some space, which would then appear dark to people inside it. Or he could prevent light from leaving some space, which would then appear dark to people outside. Neither of these is quite the same thing as what you asked, but they might achieve similar purposes.

Then again, we're also talking about comic book superheroes. "Physics as we currently know it" may not be a very safe assumption.

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Just as Magneto can't control electricity, he can't control light. His abilities are strictly to metal. But he can still use metal to reflect the light.

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being shiny isn't the same as being invisible...inewidea.com/wp-content/uploads/2010/04/20100423301.jpg –  Richard Feb 19 at 23:24
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