How does light 'know' the shortest path?

Name: How does light 'know' the shortest path?
Uploaded: 2026-07-09T13:00:07+00:00
Channel: Veritasium
Description: Light is the fastest thing in the universe. In order to be this fast it always needs to take the shortest path (as it's speed cannot change). So ho

3.6M views · 19 days ago · 1:16

Veritasium

Educational creator

Jul 9, 2026 · 3.6M views

Light is the fastest thing in the universe. In order to be this fast it always needs to take the shortest path (as it's speed cannot change). So ho