How does light house work?

Question

I keep reading that lighthouses help sailors 1) be aware of dangers like rocks and reefs, and 2) navigate in the dark. I understand that lighthouses beam a series of flashes that a sailor can see from far away, but I’m not quite sure how seeing a series of flashes in the dark from a single point-source can accomplish point 1 and point 2.

In: 8

Answer 1

lighthouse = shore = reefs, rocks and low water.

it’s like a amber flashing light in traffic. it tells you that there could be danger but not what it is.