(140 (140 a light beam is propagating through a block of glass with index of refraction n. if the glass is moving at constant velocity v in the same direction a

(140 (140 A light beam is propagating through a block of glass With index of refraction n. If the glass is moving at constant velocity v in the same direction as the beam, the velocity of the light in the glass block as measured by an observer in the lal ratory is approximately. (a) u= C +v (b) = n C C+v1+- (d) u= (c) u= n n |JEST-2013] Ans.á)