a) When monochromatic light is incident normally on a thin film, an interference pattern of bright and dark fringes is observed in light reflected from the film. Explain with the aid of a diagram why such an interference pattern is produced State what information about the film can be deduced from (1) the shape of the fringes, (ii) the separation of the fringes.
a) When monochromatic light is incident normally on a thin film, an interference pattern of bright and dark fringes is observed in light reflected from the film. Explain with the aid of a diagram why such an interference pattern is produced State what information about the film can be deduced from (1) the shape of the fringes, (ii) the separation of the fringes.
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Transcribed Image Text:(a) When monochromatic light is incident
normally on a thin film, an interference
pattern of bright and dark fringes is
observed in light reflected from the film.
Explain with the aid of a diagram why
such an interference pattern is produced
State what information about the film cau
be deduced from
(i) the shape of the fringes,
(ii) the separation of the fringes.
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