Time taken by light to travel in two different materials A and B of refractive indices \( \mu_A \) and \( \mu_B \) of same thickness is \( t_1 \) & \( t_2 \) respectively. If \( t_2-t_1=5\times 10^{-10}\,s \) and the ratio of \( \mu_A \) to \( \mu_B \) is \( 1:2 \). Then, the thickness of material, in meter is: (Given \( v_A \) & \( v_B \) are velocities of light in A and B materials respectively.)
