MHT CET 2023 Physics question
One of the slits in Young's double slit experiment is covered with a transparent sheet of thickness cm. The central fringe shifts to a position originally occupied by the 25th bright fringe. If = 5800 Å, the refractive index of the sheet is
Answer: (D)
Solution
A sheet of thickness and index introduces an extra optical path . The central fringe moves to the place of the 25th bright fringe, where the path difference was , so . With and $λ = 5800\
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