- #1
omrit
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Wikipedia states that:
"If the measurement is close enough to the surface, light rays can curve downward at a rate equal to the mean curvature of the Earth's surface. In this case, the two effects of assumed curvature and refraction could cancel each other out and the Earth will appear flat in optical experiments."
My question is -- why would the light curve necessarily downward, and why would it curve at the rate equal to the mean curvature of the Earth?
"If the measurement is close enough to the surface, light rays can curve downward at a rate equal to the mean curvature of the Earth's surface. In this case, the two effects of assumed curvature and refraction could cancel each other out and the Earth will appear flat in optical experiments."
My question is -- why would the light curve necessarily downward, and why would it curve at the rate equal to the mean curvature of the Earth?