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(b) What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide?
Asked by Bimal Last Modified
Answer Wavelength of the light beam, 
Wavelength of another light beam, 
Distance of the slits from the screen = D
Distance between the two slits = d
(a) Distance of the nth bright fringe on the screen from the central maximum is given by the relation,
(b) Let the nth bright fringe due to wavelength 
and (n − 1)th bright fringe due to wavelength 
coincide on the screen. We can equate the conditions for bright fringes as:
Hence, the least distance from the central maximum can be obtained by the relation:
Note: The value of d and D are not given in the question.
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