The advantages of Michelson's method for determining the speed of the light are as follows:
- This is a null method and so, there is no measurement of the displacement of the image.
- The image is very bright and so its position can be located with accuracy.
- The appearance and disappearance of the image are quite abrupt so that it coincides with the cross wires in the telescope only for a particular constant speed of the mirror.
- The distance between the two mirrors is very large about 35 km so as to measure the speed of the light accurately.