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(10M) a) What is a thin film? Deduce the conditions of maxima and minima in case of a thin parallel film. (4M) b) Light

(10M) a) What is a thin film? Deduce the conditions of maxima and minima in case of a thin parallel film. (4M) b) Light of wavelength 5893 is reflected is nearly normal incidence from a soap film of refractive index 1.42. What is the least thickness of the film that will appear i) Black and ii) Bright?

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