Why earth surface receive parallel light beams from sunlight?
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Some are parallel, some are slightly diverging, some are slightly converging. Colloquially speaking they are “roughly parallel”. Let’s look at each case more closely.
The Solar distance is 107.9 times the Solar diameter and the Solar diameter is 109.2 times Earth’s diameter.
To make the Earth just 10 pixels high I have to make the sun 1092 pixels high and put it 117,827 pixels away! So this makes scale drawings very difficult. So I’m not even going to try but I’m going to make a *representative* drawing that shows the general idea, but isn’t to scale.
This should show that light from a single point on the Sun would appear to be slightly diverging (but at a vanishingly small angle, and appear parallel owing to the great distance), some of the light from across the Sun would be converging (with a maximum angle of about 0.5°, the angular size of the Sun as seen from Earth), and some would be parallel just because they are
The Solar distance is 107.9 times the Solar diameter and the Solar diameter is 109.2 times Earth’s diameter.
To make the Earth just 10 pixels high I have to make the sun 1092 pixels high and put it 117,827 pixels away! So this makes scale drawings very difficult. So I’m not even going to try but I’m going to make a *representative* drawing that shows the general idea, but isn’t to scale.
This should show that light from a single point on the Sun would appear to be slightly diverging (but at a vanishingly small angle, and appear parallel owing to the great distance), some of the light from across the Sun would be converging (with a maximum angle of about 0.5°, the angular size of the Sun as seen from Earth), and some would be parallel just because they are
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