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In a double-slit experiment, the optical
path difference between the rays from two
coherent sources at a point P on one side of the
central bright band is 7.5 x 10 m and at a
point Q on the other side of the central bright
band is 1.8 x 10 m. How many bright and
dark bands are observed between points P and
Q if the wavelength of light used is 6 × 107 m?

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