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3
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What is the minimum size of an object to cast a shadow on the entire Earth?
When I fly up(don't ask me how), I see how my Sun's shadow on Earth is getting bigger but dimmer as the Sun's light is reflected from other objects.
As I flew higher and higher in the direction of the ...
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0
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1
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Can a perfect Earth-sized lens between the Earth and the sun darken parts of the Earth (so in that parts the sky looks like the night sky)? [closed]
Suppose an Earth-sized (convex) perfect lens is placed between the sun and the Earth (with the center of the lens on the line between the center of the Earth and the center of the sun, and the lens ...
2
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1
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Application of diffraction problem!
Here is a problem that I am working on, which is the applying the concepts of diffraction to the setting of the sun:
Air has a small, usually negligible index of refraction. It is 1.0002926. This ...
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