Answer: 1.57 × 10⁻⁶ m
Explanation:
For constructive interference i.e. formation of bright fringe through a diffraction grating is given by:
d sin θ = n λ
here, d is the distance between slits.
θ is the angle of diffraction
n is the order of fringe
and λ is the path difference.
λ = (d sin θ)/ n = (0.60 ×10 ⁻³m)(sin 0.30°)÷2 = 1.57 × 10⁻⁶ m
