In a YDSE a parallel beam of light of wavelength 6000 Å is incident on slits at angle of incidence 30º as shown in figure. A and B are two thin transparent films each of refractive index 1.5. Thickness of A is 20.4 μ m. Light coming through A and B have intensities I and 4I respectively on the screen. Intensity at point O which is symmetric relative to the slits is 3I. The central maxima is above O.
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CHECK THE SOLUTION.
Sol. t B = 120 μ m,
β = 6 mm ; I max = 9I, I min = I,
β /6 = 1 mm,
I (at 5 cm above 0) = 9I, I (at 5 cm below 0) = 3 I
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