Physics · Optics
A pilot flying high in a helicopter looks at the reflection of the moon in a river and finds that the apparent diameter of the moon covers the entire width of the river. After landing, the pilot notices that the moon's reflection appears much smaller than the width of the river. Why does this happen?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Both B and C✓
- 2As altitude changes, the apparent angular diameter of the moon remains practically unchanged.
- 3As altitude increases, the apparent width of the river decreases.
- 4As altitude increases, the apparent diameter of the moon increases.
Correct answer
Both B and C
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