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In Young's double slit experiment the sl...


In Young's double slit experiment the slits, `S_(1) & S_(2)` are illuminated by a parallel beam of light of wavelength 4000 Å from the medium of refractive index `n_(1)=1.2` A thin film of thickness 1.2 `mum` and refractive index n=1.5 is placed infrom of `S_(1)` perpedicular to path of light. the refractive index of medium between plane of slits & screen is `n_(2)=1.4` if the light coming from the film and `S_(1)&S_(2)` have equal intensities I then intensity at geometrical centre of the screen O is

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