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Thin Film Interference
Transcript
Thin Film Interference
- The two waves will be in constructive interference if:
1) their troughs and crests meet up; to do this, the light ray must be incident at angles close to 0 with respect to the normal
2) they are in phase with each other
- Let n1= the viscosity of the incident medium and n2= the viscosity of the new medium (thin film) (NOTE: greater n means slower wave speed)
- If n1<n2 (fast to slow), then the reflected wave is inverted (1/2λ phase shift)
- If n1>n2 (slow to fast), then the reflected wave is upright (no phase shift)
Have you ever seen this before?
Here is a good video going through several examples on thin film interference:
- if the new medium is a thin film, the transmitted portion of the wave in the new medium travels for a bit before encountering a new boundary, and is thus reflected once more
- So, there will be one wave reflected off the top of the thin film, and another wave reflected off the bottom of it
Thank you for watching!
These are all examples of thin film interference!
What is thin film interference?
- it is a type of interference of light waves through different mediums
- When a wave reaches a boundary between two different mediums, some of it is reflected off the boundary, while some of it is transmitted across it
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