क्विक चेंजिंग ऑफ डायरेक्शन डिपेंड ऑन
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Answer:
The incident angle and the amount that the speed changes.
Explanation:
The amount that a light ray changes its direction depends both on the incident angle and the amount that the speed changes. For a ray at a given incident angle, a large change in speed causes a large change in direction, and thus a large change in angle.
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