Huygens

Definition

Huygens is a principle in wave theory that states every point on a wavefront acts as a source of secondary spherical wavelets. These secondary wavelets spread out in the forward direction at the same speed as the wave itself.

5 Must Know Facts For Your Next Test

1. Huygens' principle helps explain how light waves propagate through different mediums.
2. It is crucial for understanding diffraction and interference patterns in electromagnetic waves.
3. The principle was proposed by Dutch physicist Christiaan Huygens in the 17th century.
4. Huygens' principle supports the wave theory of light, which was later unified with particle theory through quantum mechanics.
5. Applications of Huygens' principle include explaining phenomena such as reflection, refraction, and diffraction.

Review Questions

• What does Huygens' principle state about each point on a wavefront?
• How does Huygens' principle help explain diffraction and interference?
• Who proposed Huygens' principle and when?

Related terms

Diffraction:

The bending of waves around obstacles and openings, explained by Huygens' principle.

Interference:

The phenomenon where two or more waves superpose to form a resultant wave, often explained using Huygens' theory.

Wavefront: A surface over which an oscillation or vibration has a constant phase; used extensively in describing wave propagation according to Huygens.