G6 Thin-film InterferenceG6 Thin-film Interference.

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Interference in Thin Films

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Presentation transcript:

G6 Thin-film InterferenceG6 Thin-film Interference

Reflection of wave on a string

Reflection by denser medium

Reflection by less dense medium

d soap bubble n = 1.4 air

Magnesium Floride n = 1.4 glass n = 1.5 air

Example 1: What is the minimum thickness of a soap film that gives constructive interference for light that has a wavelength of 600nm in soap?

Example 2: Colored interference fringes are viewed when white light is incident on oil floating on water. The refractive index of oil is 1.5 and the refractive index of water is 1.3. What is the thinnest thickness of oil that will give constructive interference for yellow light? (λ = 580nm in air)