# Destructive interference

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## Area of ​​Expertise - optics

Interference is the superposition of waves. The intensities that occur depend on the phase difference of the waves. The phase differences must not change during the observation time.

Two waves with a phase difference $ϕ$ can strengthen or weaken. Destructive interference occurs when both waves cancel each other out, i.e. when the maximum of one wave meets the minimum of the other. In this case the phase difference is $ϕ=±π$what a distance of $λ/2$ corresponds to by which the two interfering waves are shifted from one another.

## Learning units in which the term is discussed

### Double slit tests60 min.

#### PhysicsopticsWave optics

This learning unit is about getting to know interference as an important characteristic of light waves. The historical significance of the discovery of this property in light, which gradually gained acceptance for the wave model of light propagation, is emphasized. The two-beam interference at the double slit is discussed here first.

## Video: Οργή και αγανάκτηση για την καταστροφική παρέμβαση στον Άγιο Ιωάννη Φακά (July 2022).

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