Exam-style question
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What would have been observed if light speed varied with direction relative to ether?.
- A.No change in interference pattern
- B.A measurable shift in interference fringes
- C.Light would not travel in straight lines
- D.Light would be absorbed by the apparatus
Model answer
What a good answer should say
- A measurable shift in interference fringes
Explanation
Why this works
Rule: A directional variation in light speed would cause a measurable shift in interference fringes. Substitution: Assume Δv ≠ 0.
Working: Expected shift > 0, but no shift observed. Answer: Supports constant light speed.
Conclusion: Light speed independent of direction.
Common mistake
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