A Double Slit Illuminated with Two Different Colors of Wavelengths

Multiple Choice

A double slit illuminated with two different colors of wavelengths 831 and 558 nm forms a two-colored diffraction pattern on a screen located 228 cm away.The slit separation is 36 wavelengths of 831 nm light.(a) What order maximum for λ = 831 nm occurs near x = 20.5 cm from zeroth order? (b) What order maximum for λ = 558 nm lies close to this order?

A) (a) 3 (b) 5
B) (a) 6 (b) 10
C) (a) 2 (b) 2
D) (a) 5 (b) 3