Question
In young's double-slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths λ1 = 12000 A and λ2 =10000 A. 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 fringes from the other?
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8 mm
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6 mm
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4 mm
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3 mm
Solution
B.
6 mm
Given λ1 = 12000 Ao and λ2 = 10000 Ao
D = 2 cm and d=2 mm= 2x 10-3
