26) Calculate the refractive index of a thin film of a thickness of 80 nm. The wavelength of the maximum reflected light is found to be 550 nm.
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- Light from the bottom of the film will interfere with the light from the top. When interference takes place the final intensity might increase or decrease. Constructive interference is when the intensity is increased. Destructive interference takes place when intensity reduces.
- Condition for constructive interference for a film of given refractive index and thickness is given by,
Here n is the refractive index of the film, d is the thickness, m is the order, and λ is the wavelength of the source.
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