Two thin parallel slits are made in an opaque sheet of film. When a monochromatic beam of light is shone through them at normal incidence, the first bright fringes in the transmitted light occur in air at ± 18.0° with the original direction of the light on a distant screen when the apparatus is in air. When the apparatus is immersed in a liquid, the same bright fringes now occur at ±12.6°. Find the index of refraction of the liquid.
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