Wave interference

principle · 1801 · Industrial Revolution

Waves adding up to reinforce or cancel each other (Young).

Where it is used

• Active noise cancelling — is used in. Anti-phase sound cancels the noise.
• Optical disc (CD/DVD) — is used in. The pits cancel the reflected beam by interference — that is how zeros and ones are read.
• Interferometer — is used in. Interference.
• Diffraction grating — is used in. Interference.
• Holography — is used in. An interference pattern.
• Security hologram — is used in. The image is recorded by interference.

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