1. The problem statement, all variables and given/known data At most, how many bright fringes can be formed on either side of the central bright fringe when light of wavelength 644 nm falls on a double slit whose slit separation is 3.64 × 10-6 m? 2. Relevant equations m=dsintheta/lamdba 3. The attempt at a solution m=(3.64x10e-6)(1)/644x10e-9) = 5.65 which is 6 bright fringes right but the system telling me it's wrong?