Concept:Refraction: light slows down when it passes into an optically denser medium and bends towards the normal; it bends away from the normal when it passes into a less dense medium.Explanation:Going from a dense medium into a denser one, the light slows down further, so it bends towards the normal (e.g. from water into glass).The refracted ray is not parallel or perpendicular to the incident ray in general.Answer:Option A (bends towards the normal)