Fermat’s principle says that light always chooses the path that takes the least time to travel. When light goes from air into water or glass, its speed changes, so it bends to keep its travel time as short as possible. This bending of light is called refraction. That’s why a straw in a glass of water looks bent at the surface. | Fadhel Mahdi
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Fermat’s principle says that light always chooses the path that takes the least time to travel. When light goes from air into water or glass, its speed changes, so it bends to keep its travel time as short as possible. This bending of light is called refraction. That’s why a straw in a glass of water looks bent at the surface. | Fadhel Mahdi
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