Multiple choice general knowledge

On a clear day, a beam of sunlight can be reflected off a mirror and seen up to --km away.

  1. 10

  2. 20

  3. 30

  4. 40
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

On a clear day with minimal atmospheric scattering, sunlight reflected from a mirror can theoretically be visible up to about 40 km away. This depends on weather conditions, the mirror's size, and the observer's position. The curvature of Earth and atmospheric particles eventually limit visibility, but under ideal conditions, 40 km is achievable.

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