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I mean to ask if I have a moving object and I turn on a bulb in that moving object, when viewed from an inertial frame, we usually add the speed of the moving object with the object's velocity to get its velocity with respect to the inertial frame.

But as I've heard the speed of light remains same in all frames? Why is that?

Heisenberg
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    https://en.wikipedia.org/wiki/Special_relativity – hft Feb 13 '23 at 18:14
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    The body of your question doesn’t mention any non-inertial frame. Do you understand what inertial and non-inertial frames are? – Ghoster Feb 13 '23 at 18:22
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    we usually add… That’s just a good approximation at low speeds. Until you studied Special Relativity, you didn’t know you’d been doing it wrong. – Ghoster Feb 13 '23 at 18:28
  • @Ghoster sorry for the unclear language, I meant an accelerating frame. But I think I've got my answer, which is special relativity, I'm yet to study it, so I'll look more into it – Heisenberg Feb 13 '23 at 18:32

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Because it doesn't. This fact came as a surprise, forcing physics to revise its models of space and time. In those revised models, the speed of light is the same in all frames, but it is the phenomena that force these models on us. You may sensibly ask "what experiments and observations show that the speed of light is the same in all frames", but there is no "why". It's how the universe works.

John Doty
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