V0 and VE represent the velocities, µ0 and µE the refractive indices of ordinary and extraordinary rays for a doubly refracting crystal. Then
Answer & explanation
Correct answer: option 3
In double refraction light rays always splits into two rays (O-ray & E-ray). O-ray has same velocity in all direction but E-ray has different velocity in different direction.
For calcite µe < µ0 ⇒ ve > v0
For quartz µe > µ0 ⇒ v0 > ve