I've been looking around, and can't find a solid answer. Many websites say darkness is the speed of light due to the fact it is the absence of light, but other sources say otherwise, that in some cases darkness is actually faster in some cases. Could someone clarify this for me?
In this image this is shown that suppose there is darkness on any many light year far object if someone switch the torch in the direction of object and after some instant raise his hand and cover the light then before the light the darkness will reach on object which is completely wrong. Since the darkness which is assumed to be reach before light is the darkness there before the light reach on the object.