When light travels from a less dense medium to a more dense medium it:
Q1. When light travels from a less dense medium to a more dense medium it:
Answer: Slows down and bends toward the normal
Explanation: When light travels from a less optically dense medium to a more dense medium (e.g., air to glass), it slows down and the refracted ray bends toward the normal. This is described by Snell's law: n₁ sin θ₁ = n₂ sin θ₂.