Hughes–Drever experiment
The scientists named Hughes and Drever wanted to know if the earth moving around the sun changed the speed of light. So, they created an experiment to test this out.
They used a special kind of laser that produces beams of light that are all the same wavelength. That means that all the light is the same color and travels at the same speed.
They directed the laser beam onto a spinning mirror that reflects the light back and forth. When the mirror is still, the beam of light bounces back and forth in a straight line. But when the mirror is spinning, the beam of light is moved slightly each time it bounces off the mirror.
The scientists measured the light beams before and after the spinning mirror and found that the speed of light was just the same before and after the spinning mirror. This means that the earth's movement around the sun doesn't change the speed of light.
This experiment helped scientists understand more about the relationship between light and motion, and how the speed of light is always constant no matter what.
They used a special kind of laser that produces beams of light that are all the same wavelength. That means that all the light is the same color and travels at the same speed.
They directed the laser beam onto a spinning mirror that reflects the light back and forth. When the mirror is still, the beam of light bounces back and forth in a straight line. But when the mirror is spinning, the beam of light is moved slightly each time it bounces off the mirror.
The scientists measured the light beams before and after the spinning mirror and found that the speed of light was just the same before and after the spinning mirror. This means that the earth's movement around the sun doesn't change the speed of light.
This experiment helped scientists understand more about the relationship between light and motion, and how the speed of light is always constant no matter what.