A student is conducting youngs double slit experiment  in order to find the wavelength of the incident light. He observed the 6th  order bright fringe at  a position y on the screen. He noticed a sudden change in the interference pattern when a soap bubble of refractive index n pass thro the ray1. What is the change he observed in the interference pattern (expected answer: shifted to the top or to the bottom). explain in your own words.

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A student is conducting youngs double slit
experiment  in order to find the
wavelength of the incident light. He observed the 6th  order bright fringe at  a position y on the screen. He noticed a sudden change in the interference pattern when a soap bubble of refractive index n pass thro the ray1. What is the change he observed in the interference pattern (expected answer: shifted to the top or to the bottom). explain in your own words. 

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