Time taken by light to travel in two different materials A and B of refractive indices μA and μB of same thickness is t1 and t2 respectively. If t2 – t1 = 5 × 10–10 s and the ratio of μA to μB is 1 ∶ 2. Then, the thickness of material, in meter is: (Given vA and vB are velocities of light in A and B materials, respectively.)
1
5 × 10-10 vA m
2
5 × 10-10 m
3
1.5 × 10-10 m
4
5 × 10-10 vB m