Reply to post: Re: Faster than light

Three certainties in life: Death, taxes and the speed of light – wait no, maybe not that last one

anonymous boring coward Silver badge

Re: Faster than light

"Eventually, with a minuscule change in angle, the spot of light on the wall will be travelling faster than the speed of light. Or will it?"

The fallacy here is to see the lightbeam as some kind of rigid rod that instantly moves as you move its base.

Think of it instead as water coming out of a hose. As you move the hose, the water bends. So the spot, in this case, will not move instantly at all.

Before the spot "moves" (it's actually constantly a new spot), light has to travel all the way from the torch to the wall.

Well, that's my layman explanation anyway.

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