In a Michelson's determination of the velocity of light, no shift in the image was observed with a 16 face mirror rotating at 1500 r.p.m. If the distance travelled by light one way is 7500m, the velocity of the light is
5 `xx` 108 m / s
3 `xx` 108 m / s
2.5 `xx` 108 m / s
6 `xx` 106 m / s