NEET 2013 Physics question
In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths and . At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other ?
Answer: (2)
Solution
Fringe widths with mm, m. m mm; mm. Bright fringes coincide when
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