What causes the curvy line to exist?

Question

Excuse me, but I am wondering what optical phenomena causes the curvy line to exist on the iron fence?

Possible duplicates: https://physics.stackexchange.com/q/417927/2451 , https://physics.stackexchange.com/q/183481/2451 and links therein. — Qmechanic, Oct 09 '23 at 08:18

score 0 · Answer 1 · answered Oct 09 '23 at 07:45

0

answered Oct 09 '23 at 07:45

John

1 Answers1