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What do you mean by thin film? Comment on the colors in thin film in sunlight.

written 6.4 years ago by vermavarsha432 • 1.0k

modified 5.1 years ago by sanketshingote • 100

advanced engineering physics

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written 6.3 years ago by vermavarsha432 • 1.0k

•   modified 6.2 years ago

• Thin film is the film whose thickness is of the order of wavelength of the light.It is used to expose it to light.
  • When a thin film is exposed to sunlight, it shows beautiful colours in the reflected system.
  • Light is reflected from the top and bottom surfaces of a thin film and the reflected rays interfere.
  • The path difference between the interfering rays depends on the thickness of the film and the angle of refraction and hence on the inclination of the incident ray.
  • White light consists of a continuous range of wavelengths.
  • At a particular point of the film and for a particular position of the eye ( with t and r constant) those wavelengths of incident light that satisfy the condition for the constructive interference in the reflected system will be seen in reflected light.
  • The colour seen will vary with the thickness of the film and inclination of the rays ( with the position of the eye with respect to the film).
  • So, if the same point of the film is observed with an eye in different positions or different points of the film are observed with the eye in the same position, a different set of colours is observed each time.

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