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I asked my father . He replied : Under the sofa -.-

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  • $\begingroup$ Why has it to go anywhere? Darkness is just the absense of light, not a physical entity in itself. $\endgroup$ – ACuriousMind Feb 12 '15 at 18:33
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    $\begingroup$ any law of the conservation of darkness ? $\endgroup$ – Wadiaro Wapoo Feb 12 '15 at 18:34
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    $\begingroup$ When you fill a cup with water, where does the empty space go? Or when you turn on music, where does the silence go? $\endgroup$ – Ruslan Feb 12 '15 at 18:54
  • $\begingroup$ Related: physics.stackexchange.com/q/90892 $\endgroup$ – Kyle Kanos Feb 12 '15 at 18:58
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Darkness is nothing, it is not a physical entity. Darkness is what you have when there are no/very less photons, and thus you can't see anything. When you light a lamp, the photons from the lamp bounce all over the room, and hence the darkness "disappears", so to speak. Absence of light doesn't exist when there is presence of light.

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I'm not sure if this is worth an answer but anyway-

darkness is not a physical entity in itself. It is simply where light isn't. As it is not an entity, it doed not have to go anywhere when you turn on a light, it just seizes to exist as light enters the place where beforehand it wasn't.

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