Why do shadows “pinch” together and form a bridge when they get close enough to each other?

Question

Why do shadows “pinch” together and form a bridge when they get close enough to each other?

In: 13

Answer 1

Because the sun isn’t a single point of light. Since the sun produces a diffused source of light, shadows cast have a feature called a penundra. Another reply refers to this as a “fuzzy shadow.” What you see are the penundras of two different shadows landing on top of each other.