Final answer:
The refractive index of diamond (2.42) indicates how light behaves in the material compared to vacuum. It affects the angle at which light bends when entering diamond.
Explanation:
The refractive index of diamond being 2.42 means that light travels approximately 2.42 times faster in a vacuum than in diamond. It also indicates that light bends at a different angle when entering diamond compared to air due to the change in speed.
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