2.
a) An oil (μ0 = 1.45) film of thickness 280 nm floats on water (μw = 1.33). It is illuminated
by white light at normal incidence. Which colour in the visible spectrum will be most
strongly (i) reflected, and (ii) transmitted?
b) Obtain the expression for shift in fringes when a thin transparent sheet is introduced in
the path of one of the waves in a double slit interference experiment.
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