Light bends when transitioning between mediums because its speed changes. A light ray bends away from the normal when going from a denser to a rarer medium.Since the ray curves away from the normal when moving from Medium 1 (incident) to Medium 2 (refracted), this means light travels faster in Medium 1 than in Medium 2. This is because light accelerates when entering a less dense medium, causing it to bend away from the normal.Therefore, light's speed is higher in Medium 1.
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