Optics Question!
A thin film of material is to be tested on a glass sheet for use in making reflective coatings. The film has an index for refraction nf=1.38. White light is incident normal to the surface of the film. It is observed that at a point where the light is incident on film, light reflected from the film appears green. (Lambda=525nm)

Calculate the minimum thickness of the film that would produce this green reflection.

Question

Optics Question!
A thin film of material is to be tested on a glass sheet for use in making reflective coatings. The film has an index for refraction nf=1.38. White light is incident normal to the surface of the film. It is observed that at a point where the light is incident on film, light reflected from the film appears green. (Lambda=525nm)

Calculate the minimum thickness of the film that would produce this green reflection.

anonymous · Answer

Index of refraction of air=1
Index of refraction of glass=1.5
Frequency of green light= 5.71E14
Wavelength of green light in film=380nm
Speed of light in film=2.17E8

Diagram of setup:
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