Light reflecting off the front and back surfaces of the thin soap film

# Light reflecting off the front and back surfaces of

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of interference. Light reflecting off the front and back surfaces of the thin soap film interferes, resulting in different colors being enhanced. Constructive interference is a type of interference that occurs at any location along the medium where the two interfering waves have a displacement in the same direction. In this case, both waves have an upward displacement; consequently, the medium has an upward displacement that is greater than the displacement of the two interfering pulses. Constructive interference is observed at any location where the two interfering waves are displaced upward. But it is also observed when both interfering waves are displaced downward. This is shown in the diagram Destructive interference –waves combine to produce a smaller wave or a zero amplitude wave. The waves are competing so they end up cancelling each other out. Example-”dead zones/seats in an old theater Resonance:

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A kid on a swing, pumps their legs at the same frequency each time to cause them to swing higher each time. They are matching the natural frequency of the string. A wine glass has a natural frequency. A singer can sing at the same frequency and can cause the glass to vibrate until it shatters.
• Spring '17
• Roger Kwok
• Diffraction, Wavelength, 250 feet, Zana Melvin

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