🏆 which
Which force causes light to travel in straight lines in empty space?
PhysicsOptics
Quick Answer
The electromagnetic force governs light, and in empty space light travels in straight lines unless spacetime itself is curved. Photons are the carriers of electromagnetic radiation.
The Full Story
Light is an electromagnetic wave made of photons. In flat, empty space, photons move in straight lines at about 299,792,458 meters per second, the defined speed of light. They can bend around massive objects only because gravity curves spacetime, not because another force pushes them. This is why gravitational lensing can distort distant galaxies and stars. Electromagnetism gives light its nature, while gravity can alter its path.
Key Facts
1.Speed of light: 299,792,458 m/s
2.Photons are electromagnetic particles
3.Gravity can bend light via spacetime curvature
YouTube Angle
Suggested video title for this topic:
"Why light goes straight until gravity says otherwise"