Explanation:
theta = m wavelength/ silt width
gives angular position of minimas where m= 1,2,3...
As
0.347° = pi/180 × 0.347 rad = 0.006 rad
using above formula
0.006= 1 × wavelength/ 8.32 × 10^-5 m
wavelength = 0.006× 8.32 × 10^ -5 m
= 0.04992× 10^ -9 m
= 499× 10^ -9m
=499 nm
which is almost 500 nm
