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12) Calculate the maximum reflected wavelength by a thin film of refractive index 1.4 and thickness 95 nm.

12) Calculate the maximum reflected wavelength by a thin film of refractive index 1.4 and thickness 95 nm.

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12) Calculate the maximum reflected wavelength by a thin film of refractive index 1.4 and thickness 95 nm.
Transcribed Image Text:12) Calculate the maximum reflected wavelength by a thin film of refractive index 1.4 and thickness 95 nm.
Expert Solution
Concept and Principle:
  • In a thin film, light waves are reflected from the background and the film is capable of interfering with each other.

 

  • 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,

2nd=(m+12)λ

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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