Explain why light bends when it enters a different medium.
Answer
Because its speed changes in the new medium, causing a change in direction.
The correct answer is Because its speed changes in the new medium, causing a change in direction. — The change in speed changes the direction of propagation – this is refraction.
Step-by-step solution
- Light travels at a constant speed in vacuum.
- When it enters another medium its speed changes.
- The change in speed changes the direction of propagation – this is refraction.
Common mistake: Assuming light changes direction because of a force
Concept tested: Refraction principle
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