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9) A film with a refractive index of 1.25 strongly reflects light of 550 nm. If the film is on water calculate the minimum thickness.

9) A film with a refractive index of 1.25 strongly reflects light of 550 nm. If the film is on water calculate the minimum thickness.

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9) A film with a refractive index of 1.25 strongly reflects light of 550 nm. If the film is on water calculate the minimum thickness.
Transcribed Image Text:9) A film with a refractive index of 1.25 strongly reflects light of 550 nm. If the film is on water calculate the minimum thickness.
Expert Solution
Concept and Principle:
  • Light reflected from thin film undergoes interference. Thus the final intensity might increase or decrease. 

 

  • When interference takes place 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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