Question

Two slits are separated by 0.32 mm. A beam of 500 nm light strikes the slits producing an interference pattern. Determine the number of maxima observed in the angular range -30° < θ < 30°

Answer 1

Fringe width 

Therefore, number of fringe width in a distance y is 

Therefor, total number of maximas obtained in the angular range -30° < θ < 30° (including the central one) is N = 2 x 369 + 1 = 739