The refractive index of water and olive oil is 1.33 and 1.46 respectively. When light passes from water to olive oil, the light ray bends towards the normal.
A light ray bends towards the normal when it travels from a rarer to a denser medium. In the above case, when light passes from water to olive oil, the light ray bends towards the normal because refractive index of olive oil is more than water.