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Consider double slits with one slit covered by a thin film with its thickness t= 0.1 mm. The index of
refraction of the film is n = 1.5. d = 0.5 mm.
S,
d
S2
(a) What is the path difference between two lights passing through the slits?
(b) Find a condition for a constructive interference on the screen.
(c) Find an angle for the 2nd maxima with m =+2 and -2 (Consider the central maximum as a
zeroth maximum.).

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