In a frame S, there are two stationary objects A & B at a distance L in the x-direction. Object A is nearer to the observer than object B. Light will take time T to reach object B from A. Therefore in frame S, L/T = c In another frame S’, both objects A & B are moving at velocity v in positive x-direction with respect to the observer. Therefore in frame S’, the distance between object A & B will be : L’ = L/(gamma) and the time for light to reach object B from A will be: T’ = T(gamma) An observer in frame S’ will observe that the total distance travelled by light in reaching object B from A will be: L’ +v(T’) Also, the time taken by light to reach object B from A will be: T’ Thus, an observer in frame S’ will calculate the speed of light to be: [L’ + v(T’)]/T’ = (L’/T’) + v = [c/(gamma)^2] + v Thus, in frame S’, the speed of light will not be c. How?