When a light beam travels from a solid into a vacuum, it moves from a denser medium to a less dense medium. According to Snell's Law, as light exits the denser medium (solid) into the less dense medium (vacuum), it speeds up, resulting in a larger angle of refraction compared to the angle of incidence. This phenomenon is due to the change in speed of light in different materials, leading to the observed relationship where the angle of incidence is greater than the angle of refraction.
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