GATE PH 2023 PH Q54: Atomic and Molecular Physics

Different spectral lines of the Balmer series (transitions

, with

being the principal quantum number) fall one at a time on a Young’s double slit apparatus. The separation between the slits is

and the screen is placed at a constant distance from the slits. What factor should

be multiplied by to maintain a constant fringe width for various lines, as

takes different allowed values?

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